A computer worm is on the loose that denies Facebook users access to their accounts. The worm, dubbed “W32.Yimfoca,” is being spread through Yahoo! Messenger. The only way to gain access to your Facebook account is to fill out a survey. Each time a survey is filled out the people behind the worm receive $1, Symantec reported. Facebook is currently blocking users’ ability to spread links containing this malicious scam. The scam is only affecting people using the Internet Explorer Web browser.
Source: https://thehackernews.com/2010/12/facebook-worm-spreads-through-yahoo.html