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Social networking web sites, which allow users to create identities and link them to friends who have also created identities, are highly popular. Systems such as Facebook and MySpace utilize a traditional client-server approach to achieve this, which means that all identities and their social links (the entire social network) are stored and administered on central servers. Although this approach supports highly mobile user access -users can log-in from any computer -it also poses highdoi:10.1109/wetice.2009.30 dblp:conf/wetice/AbbasPES09 fatcat:bnw35f34pvcjrhg3l6frp7ijpa