In response to a request by @Gahlord to research the concept of “social proximity” I have found eight articles that broadly sketch the primary issues and principles related to “social proximity”.
In Towards Design Guidelines for Portable Digital Proximities A Case study with Social Net and Social Proximity (.pdf), the authors apparently introduced the concept of social proximity, which they define as:
[T]he relationships between people in space, within social networks, and through time.
In Life in the network: the coming age of computational social science, the authors discuss the rapidly changing pace of computational social science.
In To join or not to join: the illusion of privacy in social networks with mixed public and private user profiles (.pdf) the authors discuss privacy issues related to social media and the natural tension between “public” and “private” information (see also my earlier article relating to this topic).
In Inferring friendship network structure by using mobile phone data, the authors found that it’s possible to infer with 95% accuracy friendships based on mobile data.
In Bridging the Gap Between Physical Location and Online Social Networks (.pdf), the authors demonstrate how to predict friendship between two users using their respective location trails.
In Social distance, heterogeneity, and social interactions (.pdf, and I hope you’re good in mathematics to understand this article), the authors propose a new model to analyze peer group interactions.
In Connectivity Does Not Ensure Community: On Social Capital, Networks and Communities of Place (.pdf), the author proposes that the strongest online communities are those create senses of social ownership within the community.
In Semantic Grounding of Tag Relatedness in Social Bookmarking Systems (.pdf) the authors discuss how collaborative tagging systems can be used to derive a global tagging relatedness structure from an uncontrolled tagging folksonomy.
In The anatomy of a large-scale social search engine (.pdf) the authors present Aardvark, a social search engine.