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Online Social Networks (OSNs) have become ubiquitous in the past few years, counting hundreds of millions of people as members. In this paper, the authors show that the ease of accessing third party information by engineering OSN features, makes users vulnerable to infiltration attacks. Providing invaluable user context information, such attacks can become dangerous tools in the hands of spammers and phishers. Using a set of primitive attacks, they formalize a new infiltration attack called the 3-Clique attack. They design an automated attack system, iFriendU, to demonstrate the effectiveness of these attacks on more than 10,000 Facebook users.
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