Association for Computing Machinery
Online social networks are now a popular way for users to connect, express them, and share content. For example, MySpace (over 275 million users), Facebook (over 300 million users), Orkut (over 67 million users), and LinkedIn (over 50 million \"Professionals\") are examples of wildly popular networks used to find and organize contacts. Online social networks are now a popular way for users to connect, express them, and share content. Users in to-day's online social networks often post a profile, consisting of attributes like geographic location, interests, and schools attended. Such profile information is used on the sites as a basis for grouping users, for sharing content, and for suggesting users who may benefit from interaction. However, in practice, not all users provide these attributes.