Security company Sophos warned recently that hackers were making posts to Facebook’s Wall feature that linked to malicious Web sites. Facebook has now blocked the links from anywhere on its site, and told users how to remove the malware. The company says only a tiny fraction of its users were affected.

The posts impersonated friends, and asked you to click on a link to see a video supposedly hosted by . Clicking the link took you to a malicious Web site, where you were told to download the latest version of Flash Player in order to see the video.

If you did so, a Trojan would be installed on your computer. Then other malware would be downloaded and your PC taken over by the hacker.

There are some 80 million active users. If you are one of them, be cautious about clicking on links you see. Never ever share your password with anyone, especially not someone claiming to be a representative of the company. To begin your session, click your Desktop icon or Favorites link, or manually type www.facebook.com into your browser.

Do not connect via links in emails or on Web sites. It could be a phishing scam. Be on guard for similar attacks at other sites.

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