An interesting article from the guys at FaceCrooks.com:

Microsoft recently announced that it had found a malicious browser extension making the rounds on Mozilla Firefox and Google Chrome that, when downloaded, attempted to hijack users’ Facebook profiles.

The Trojan works by first seeing if the user is logged in to Facebook. If so, it tries to get a configuration file from the website in order to take control of a user’s profile. Some of the malware’s actions have so far included posting “15 YEAR-OLD VICTIM OF BULLYING COMMITS SUICIDE AFTER SHOWING HER BREASTS ON FACEBOOK” in Portuguese with a URL link to a fake video, posting promotions in the comments section of posts and pages, like “Get a brand new Celta paying R$13 per day!!”, and sending out messages via Facebook chat, like “The coolest tune at the moment. It’s really nice!”

Read more  here.