facebook blocked me due to malware infected

Though this is the OS X Server forum, I'm going to assume that you're really running OS X client and not OS X Server in the following...

Have you been entering your administrative password for various downloads, whether for video players or security tools or other stuff that's being offered to you when you visit various pages? Some of that is malware. Some of the malware that's around sends out warnings like that. The announcement will variously offer some tool or service to decontaminate the system and, well, then your computer really is infested.

On your OS X system, run Software Update ( > Software Update), and load the current updates to bring you to 10.6.8 or 10.7.3 (depending on what you're running) and that'll load the Java patch and related, and it'll clean off some of the recent cruft that might have been installed, and it'll also disable Java access from your browser by default. Also make sure your Adobe Flash Player is current, by going directly to the Adobe web site and updating that tool.

Then check with the Facebook security folks (http://www.facebook.com/security?), and see what they have to say about whatever notice you've received here.

STOP.

hi, i tried to get on facebook tonight and it says my account is blocked due to infected computor,

Facebook are NOT in the business of hunting down malware, or blocking infected users from their site. If they were, 50% of their user base would disappear overnight.

I'm almost going to guarantee that what you saw was NOT a message from Facebook. It might have been from someone claiming to be Facebook, or someone looking like Facebook, but it wasn't Facebook themselves. It was more likely some scam artist trying to con you into downloading their anti-virus 'fix' which, in reality, is malware in itself - it's classic social engineering trying to fool unsuspecting users into installing their junk.

I might be wrong, but somehow I don't think I am.

Facebook are NOT in the business of hunting down malware, or blocking infected users from their site.

Though Facebook has now started partnering with anti-malware security vendors