The Semantic Web User Model (SWUM) is an ontology with the goal to cover all attributes used and needed to model a user in the social web. We therefore analyzed 17 different social networks for the most common attributes and create the SWUM accordingly.
You can find the SWUM here: http://swum-ontology.org
Reference with the analysis:
User Modeling for the Social Semantic Web
Till Plumbaum, Songxuan Wu, Ernesto William De Luca, Sahin Albayrak