We use cookies to provide you with a better experience. If you continue to use this site, we'll assume you're happy with this. Alternatively, click here to find out how to manage these cookies

hide cookie message
2,847 Tutorials

Did Facebook Give me a Virus?

QueenPendragon received a very scary message from Facebook

Facebook told QueenPendragon that her PC was infected. The message looked very much like rogue malware trying to trick her into downloading something vicious. She asked the Antivirus & Security Software forum for advice.

I have to admit that when I first read QueenPendragon's story, I assumed she caught a rogue.

I was wrong. The message actually came from Facebook.

You'll be happy to know that Facebook doesn't intentionally infect your PC, or scan your hard drive looking for malware. (Why should they? They already know so much about you.) But Facebook does look for suspicious behavior in how you access the social networking site. For instance, if you appear to be sending out a great many messages in a short amount of time, there's reason to believe that a botnet is sending them out through your computer.

In those situations, Facebook may block your access to protect other users, and recommend you scan your hard drive.

The company has a legitimate concern. Remember the Koobface Trojan? You'd get a message through Facebook, appearing to be from a friend, trying to get you to play a particular video. Only the video wouldn't play until you updated Flash. And that "Flash Update" turned your PC into a botnet-controlled zombie. Obviously, it's in Facebook's interest to keep that from happening.

Facebook's solution to a perceived threat is for you to scan your computer with a special online scanner that MacAfee makes available specifically through Facebook. I tried the MacAfee scanner out, and found it harmless, in that it doesn't load a lot of junk onto your PC (although it may require you to update Flash).

You might want to augment it with a scan by the security software of your choice (when you have reason to be suspicious, the more scans the better), but you'll have to run MacAfee's to get clearance from Facebook and have everything working again.

Read the original forum discussion.

Contributing Editor Lincoln Spector writes about technology and cinema. Email your tech questions to him at answer@pcworld.com, or post them to a community of helpful folks on the PCW Answer Line forum. Follow Lincoln on Twitter.

IDG UK Sites

45 Best Android games: top Android games for your smartphone or tablet in 2014 (24 are free!)

IDG UK Sites

How Apple, Adobe, Microsoft and others have let us down over UltraHD and hiDPI screens

IDG UK Sites

Do you have the X-Factor too? Mix Off app puts fans in the frame

IDG UK Sites

iPad Pro release date, rumours and leaked images - 12.9 screen 'coming in 2015'