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15 sites follow a two-phase procedure that only allows a link to be established when both parties agree. Certain sites, such as Flickr, have social networks with directed links (meaning a link from A to B does not imply the presence of a reverse link), whereas others, such as Orkut, have social networks with undirected links. Users link to other users for numerous reasons. The target of a link may be a real-world acquaintance, a business contact, a virtual acquaintance, someone who shares the same interests, someone who uploads interesting content, and so on. In fact, some users even consider the acquisition of many links to be a goal in itself [36]. When compared to links in the Web, links in online social networks combine the functionality of both hyperlinks and bookmarks. A user’s links, along with her profile, are usually visible to those who visit the user’s account. Thus, users are able to navigate the social network by following user- to-user links, browsing the profile information and any contributed content of visited users as they go. Certain sites, including LinkedIn, only allow browsing of profiles within the user’s own neighborhood (i.e., a user can only view other users that are within two hops), while other sites, such as Flickr, allow users to view any other user in the system. Groups Most sites also enable users to create special interest groups, which are akin to Usenet [127] newsgroups. Users can post messages to groups (visible to all groupPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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