Don't be alarmed if you open up your Facebook account and get a large warning message that says, "Your computer or network might be infected."
Facebook announced today that its security team has joined a consortium of computer security experts working to clean up malicious malware called DNSChanger. As a result, the social network can now notify victims, who may have infected computers, and help them figure out how to rid their networks of the botnet. (See full warning below).
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Facebook warns users of the end of the Internet via DNSChanger | Internet & Media - CNET News