You can read the full article here - a good summary of some of the problems faced by Social Networking sites as hackers and confidence tricksters move in on previously unsoiled ground. From the article:

Chris Boyd, director of Malware research at Facetime Security Labs, said sites such as MySpace and Orkut often felt like "gated communities" and made people feel more secure than they should.

"They might click something that outside of that community they would usually think twice about," he added.

It's good to note that sites such as Orkut and Myspace are reacting quickly to these issues - the question is, can they keep up with the bad guys?