In terms of decentralization, we have a framework as shown above, in which we have a user trusted server, where he /she can hold data (photos) without giving it to other social networking sites. Information is disseminated, which results in potential privacy problems. Secondly such sites do not allow users much control over how their personal Information on one site is not usable in the others. Firstly, these sites form information silos. However, these sites present two problems. Have millions of users using them everyday. Web sites such as Facebook, MySpace and Orkut Social networking forms an important part of online activities of Web users.
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