1. A system for implementing security in social applications, comprising hardware processing resources communicating with hardware memory resources to implement: an inference engine to infer a closeness level, based on a closeness policy, between a first user having a user's profile on a social application and a second user having an existing connection in the social application to the first user, the inference engine to assign a score to the inferred closeness level; and a security implementation engine to implement a security level, based on said score, that is individualized to said second user, the security level dictating a corresponding set of security mechanisms to be applied to communications received by the first user from the second user such that the security level applied to the second user corresponds to the inferred closeness level.