Small World Theory

Definition: Small world theory is the idea that amongst any two people, there are likely to be some overlapping social networks. (Also called the "six degrees of separation theory.")

Application: Research has shown that people are more likely to have positive, trusting feelings towards you if you are able to connect over a common acquaintance.

Adaptation: As community developers, the more people we know in a community, the greater our social capital in that community. If we are able to build numerous relationships with people who can vouch for our trustworthiness, we will be able to extend our social networks more quickly.

References:

Milgram, S. (1967) The Small-World Problem. Psychology Today (May), 62-67.