A warning for users of Facebook, MySpace and other social networking sites about a new strain of the "koobeface" worm.
Security experts say the latest version arrives as an invitation from a user's friend or contact, inviting them to click on a link and view a video at a fake YouTube site and install an Adobe flash plug-in.
Instead, the worm installs a trojan horse program, giving control of the infected user's computer.
Trend Micro, which documented the new strain, recommends using caution when clicking on links in unsolicited messages, even if they appear to come from someone you know.
Also, don't install applications or programs you aren't looking for and research any program before installing it.
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