Here is a common example message:
VIRUS ON FB using your pictures. It says you have been tagged in a picture, wants you to click on a link to see it, then hacks into your computer & all your accounts, including banking & other secure accounts. It destroys your computer.
Once hacked into your computer, it sends e-mails to your friends telling them they have been tagged in pictures & starts the process again. PLEASE RE-POST
Although, Internet criminals often do use links in bogus messages as a means of fooling recipients into downloading malware, there are no indications that any malware or viruses are currently being distributed on Facebook in the manner reported in this warning message. The most probable reason is that folks get great kicks in seeing how far the chain message of 'worrying people' will spread.