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16 members) and even upload shared content to the group. Certain groups are moder- ated, and admission to the group is controlled by a single group maintainer, while other groups are open for any member to join. All sites today require explicit group declaration by users; users must manually create groups, appoint administrators (if necessary), and declare which groups they are a member of. Certain sites (such as Facebook) create a few pre-populated groups based on the domain of users’ email addresses, but the majority of groups do not fall into this category. The primary use of groups in today’s networks is to either express access control policies or to provide a forum for shared content. Examples of the former include sites like Facebook, which, by default, allows only users located in the same geographic location or organization to view each other’s profiles. Examples of the latter are more common, including Flickr’s shared photo groups and Orkut’s communities feature. Content Once an identity is created, users of content-sharing sites can upload content onto their account. Many such sites enable users to mark content as public (visible to anyone) or private (visible only to their immediate “friends”), and to tag content with labels. Many sites, such as YouTube, allow users to upload an unlimited amount of content, while other sites, such as Flickr, require that users either pay a subscription fee or be subject to an upload limit. All of the content uploaded by a given user is listed in the user’s profile, allowing other users to browse through the social networkPDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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