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In mathematical sociology, interpersonal ties are defined as information-carrying connections between people. Interpersonal ties, generally, come in three varieties: strong, weak, or absent. Weak social ties, it is argued, are responsible for the majority of the embeddedness and structure of social networks in society as well as the transmission of information through these networks. Specifically, more novel information flows to individuals through weak rather than strong ties. Because our close friends tend to move in the same circles that we do, the information they receive overlaps considerably with what we already know. Acquaintances, by contrast, know people that we do not, and thus receive more novel information.
Included in the definition of absent ties, according to Granovetter, are those relationships (or ties) without substantial significance, such as "nodding" relationships between people living on the same street, or the "tie", for example, to a frequent vendor one would buy from. Furthermore, the fact that two people may know each other by name does not necessarily qualify the existence of a weak tie. If their interaction is negligible the tie may be absent. The "strength" of an interpersonal tie is a linear combination of the amount of time, the emotional intensity, the intimacy (or mutual confiding), and the reciprocal services which characterize each tie.
One of the earliest writers to describe the nature of the ties between people was German scientist and philosopher, Johann Wolfgang von Goethe. In his classic 1809 novella, Elective Affinities, Goethe discussed the "marriage tie." The analogy shows how strong marriage unions are similar in character to particles of quicksilver, which find unity through the process of chemical affinity.
In 1954, the Russian mathematical psychologist Anatol Rapoport commented on the "well-known fact that the likely contacts of two individuals who are closely acquainted tend to be more overlapping than those of two arbitrarily selected individuals." This argument became one of the cornerstones of social network theory.
In 1973, stimulated by the work of Rapoport and Harvard theorist Harrison White, the American sociologist Mark Granovetter published The Strength of Weak Ties. This paper is now recognized as one of the most influential sociology papers ever written.
To obtain data for his doctoral thesis, Granovetter interviewed dozens of people to find out how social networks are used to land new jobs. Granovetter found that most jobs were found through "weak" acquaintances. This pattern reminded Granovetter of his freshman chemistry lesson that demonstrated how "weak" hydrogen bonds hold huge water molecules together, which are themselves held together by "strong" covalent bonds.
In Granovetter's view, a similar combination of strong and weak bonds holds the members of society together. This model became the basis of his first manuscript on the importance of weak social ties in human life. He submitted his paper to the American Sociological Review in 1969, but it was rejected. Nevertheless, in 1972, Granovetter submitted a shortened version to the American Journal of Sociology, and it was finally published in May 1973. According to Current Contents, by 1986, the Weak Ties paper had become a citation classic, being one of the most cited papers in sociology.
In a related line of research in 1969, anthropologist Bruce Kapferer, published "Norms and the Manipulation of Relationships in a Work Context" after doing field work in Africa. In the document, he postulated the existence of multiplex ties, characterized by multiple contexts in a relationship. In telecommunications, a multiplexer is a device that allows a transmission medium to carry a number of separate signals. In social relations, by extrapolation, "multiplexity" is the overlap of roles, exchanges, or affiliations in a social relationship.
In 1970 Dr. Granovetter submitted his doctoral dissertation to Harvard University, entitled "Changing Jobs: Channels of Mobility Information in a Suburban Community." The thesis of his dissertation illustrated the conception of weak ties. For his research, Dr. Granovetter crossed the Charles River to Newton, Massachusetts where he surveyed 282 professional, technical, and managerial workers in total. 100 were personally interviewed, in regards to the type of ties between the job changer and the contact person who provided the necessary information. Tie strength was measured in terms of how often they saw the contact person during the period of the job transition, using the following assignment:
- often = at least once a week
- occasionally = more than once a year but less than twice a week
- rarely = once a year or less
Of those who found jobs through personal contacts (N=54), 16.7% reported seeing their contact often, 55.6% reported seeing their contact occasionally, and 27.8% rarely. When asked whether a friend had told them about their current job, the most frequent answer was “not a friend, an acquaintance.” The conclusion from this study is that weak ties are an important resource in occupational mobility. When seen from a macro point of view, weak ties play a role in affecting social cohesion.
In social network theory, social relationships are viewed in terms of nodes and ties. Nodes are the individual actors within the networks, and ties are the relationships between the actors. There can be many kinds of ties between the nodes. In its most simple form, a social network is a map of all of the relevant ties between the nodes being studied.
Weak tie hypothesis
The "weak tie hypothesis" argues, using a combination of probability and mathematics, as originally stated by Anatol Rapoport in 1957, that if A is linked to both B and C, then there is a greater-than-chance probability that B and C are linked to each other:
That is, if we consider any two randomly selected individuals, such as A and B, from the set S = A, B, C, D, E, ..., of all persons with ties to either or both of them, then, for example, if A is strongly tied to both B and C, then according to probability arguments, the B-C tie is always present. The absence of the B-C tie, in this situation, would create, according to Granovetter, what is called the forbidden triad. In other words, the B-C tie, according to this logic, is always present, whether weak or strong, given the other two strong ties. In this direction, the "weak tie hypothesis" postulates that clumps or cliques of social structure will form, being bound predominately by "strong ties", and that "weak ties" will function as the crucial bridge between any two densely knit clumps of close friends.
It follows, then, that individuals with few bridging weak ties will be deprived of information from distant parts of the social system and will be confined to the provincial news and views of their close friends. From this basis, other theories can be formulated and tested, e.g. that the diffusion of information, such as rumors, may tend to be dampened by strong ties, and thus flow more easily through weak ties.
Positive ties and negative ties
Starting in the late 1940s, Anatol Rapoport and others developed a probabilistic approach to the characterization of large social networks in which the nodes are persons and the links are acquaintanceship. During these years, formulas were derived that connected local parameters such as closure of contacts, and the supposed existence of the B-C tie to the global network property of connectivity.
Moreover, acquaintanceship (in most cases) is a positive tie. However, there are also negative ties such as animosity among persons. To tackle this problem, graph theory (the mathematical study of abstract representations of networks), can be extended to include these two types of links. This creates models (called signed graphs) that represent both positive and negative sentiment relations.
This effort led to an important and non-obvious Structure Theorem for signed graphs, which was published by Frank Harary in 1953. A signed graph is called balanced if the product of the signs of all relations in every cycle (links in every graph cycle) is positive. A signed graph is unbalanced if the product is ever negative. The theorem says that if a network of interrelated positive and negative ties is balanced, then it consists of two subnetworks such that each has positive ties among its nodes and negative ties between nodes in distinct subnetworks. In other words, "my friend's enemy is my enemy".  The imagery here is of a social system that splits into two cliques. There is, however, a special case where one of the two subnetworks may be empty, which might occur in very small networks.
In these two developments, we have mathematical models bearing upon the analysis of the structure. Other early influential developments in mathematical sociology pertained to process. For instance, in 1952 Herbert Simon produced a mathematical formalization of a published theory of social groups by constructing a model consisting of a deterministic system of differential equations. A formal study of the system led to theorems about the dynamics and the implied equilibrium states of any group.
The individualistic perspective
Granovetter’s work (1973) proved to be crucial in the individualistic approach of the social network theory as seen by the amount of references in other papers. His argument asserts that weak ties (acquaintances, according to Granovetter, 1973; 1983) are less likely to be involved within the social network than strong ties (close friends and family). By not going further in the strong ties, but focusing on the weak ties, Granovetter highlights the importance of acquaintances in social networks. He argues, that the only thing that can connect two social networks with strong ties is a weak tie: “… these clumps / [strong ties networks] would not, in fact, be connected to one another at all were it not for the existence of weak ties. (Granovetter, 1973 pp 1363; 1983 pp 202).
It follows that in an all-covering social network individuals are disadvantageous with a few weak links compared to individuals with multiple weak links as they are disconnected with the other parts of the network. Another interesting observation that Granovetter makes in his work is the fact of forth going specialization of individuals creates the necessity for weak ties as all the other specialist information and knowledge is present in other social networks (Granovetter, 1973).
Cross et al., (2001) confirm this by presenting six features which differentiate effective and ineffective knowledge sharing relations: “1)knowing what other person knows and thus when to turn to them; 2) being able to gain timely access to that person; 3) willingness of the person sought out to engage in the problem solving rather than dump information; 4) a degree of safety in the relationship that promoted learning and creativity; 5) the factors put by Geert Hofstede; and 6) individual characteristics, such as openness" (pp 5). This fits in nicely with Granovetter’s argument that “Weak ties provide people with access to information and resources beyond those available in their own social circle; but strong ties have greater motivation to be of assistance and are typically more easily available.” (Granovetter, 1983, pp 209)
This weak/strong ties paradox is elaborated by myriad authors. The extent in which individuals are connected to others is called centrality. Sparrowe & Linden (1997) argue how the position of a person in a social network confer advantages such organizational assimilation, and job performance (Sparrowe et al., 2001); Burt (1992) expects it to result in promotions, Brass (1984) affiliates centrality with power and Friedkin (1993) with influence in decision power. Other authors, such as Krackhardt and Porter (1986) contemplate the disadvantages of the position is social networks such as organizational exit (see also Sparrowe et al., 2001) and Wellman et al.,(1988) introduce the use of social networks for emotional and material support. Blau and Fingerman (2009), drawing from these and other studies, refer to weak ties as consequential strangers, positing that they provide some of the same benefits as intimates as well as many distinct and complimentary functions. 
- Granovetter, M.D. (2004). "The Impact of Social Structures on Economic Development." Journal of Economic Perspectives (Vol 19 Number 1, pp. 33-50).
- Granovetter, M.S. (1973). "The Strength of Weak Ties", Amer. J. of Sociology, Vol. 78, Issue 6, May 1360-80.
- Barabasi, Albert-Laszlo (2003). Linked - How Everything is Connected to Everything Else and What it Means for Business, Science, and Everyday Life, Plume.
- Kapferer, B. (1969). "Norms and the Manipulation of Relationships in a Work Context", in Social Networks in Urban Situations, edited by J.C. Mitchell. Manchester: Manchester University Press.
- Interview with Bruce Kapferer (2001) by Olaf H. Smedal
- Verbrugge, Lois M.(1979). "Multiplexity in Adult Friendships", Social Forces, Vol. 57, No. 4 (Jun.), pp. 1286-1309
- Granovetter, M.S. (1970). "Changing Jobs: Channels of Mobility Information in a Suburban Community." Doctoral dissertation, Harvard University.
- *Rapoport, Anatol. (1957). "Contributions to the Theory of Random and Biased Nets." Bulletin of Mathematical Biophysics 19: 257-277.
- Granovetter, M.S. (1983). "The Strength of the Weak Tie: Revisited" [PDF], Sociological Theory, Vol. 1, 201-33.
- Cartwright, Dorwin & Harary, Frank. (1956). "Structural Balance: A Generalization of Heider's Theory." Psychological Review 63:277-293.
- Blau, Melinda and Fingerman, Karen L.(2009) Consequential Strangers: People Who Don't Seem to Matter...But Really Do, New York: W.W. Norton (in press)
- Caves, Clusters, and Weak Ties: The Six Degrees World of Inventors - Harvard Business School, Nov. 28, 2004
- The Weakening of Strong Ties - Ross Mayfield, Sept. 15, 2003
- The Power of Weak Ties (in Recruiting)
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