Some colleagues and I talked about this potential threat a few months ago, and it looks like it's finally starting to happen.
Some Facebook users checking their accounts Wednesday found odd postings of messages on their "wall" from one of their friends, saying: "lol i can't believe these pics got posted.... it's going to be BADDDD when her boyfriend sees these," followed by what looks like a genuine Facebook link.
But the link leads to a fake Facebook login page hosted on a Chinese .cn domain. The fake page actually logs the victims into Facebook, but also keeps a copy of their user names and passwords.
Soon after, the hackers post messages containing the same URL on the public "walls" of the users' friends. The technique is a powerful phishing scam, because the link seems to be coming from a trusted friend.
Hackers can use the compromised profiles to host Trojan horses such as key loggers that go on to steal banking passwords and credit card numbers.
And since many people use the same logins and passwords on multiple sites, the hackers can also check if stolen Facebook credentials will log them into eBay or Amazon, for instance.