1. A method, comprising: accessing a plurality of social networks via a network; obtaining information associated with a user's account from each of the social networks, the information from each social network comprising personal information about the user and social graph information about the user and friends of the user; comparing the personal information obtained from the plurality of social networks to determine a normalized set of personal information for the user; comparing the social graphs obtained from the plurality of social networks to determine a normalized set of friends associated with the user; and storing the normalized set of personal information and friends associated with the user in a data store; wherein each social graph comprises a plurality of nodes, the nodes including a user node and a plurality of friend nodes; and wherein comparing the social graphs includes: determining a degree of matching between similar friend nodes of the plurality of social graphs; identifying a set of maximum common subgraphs shared between the plurality of social graphs; for each pair of shared friend nodes in the set of maximum common subgraphs, adding a friend to a set of normalized friends associated with the user.