False Positive? on Facebook

Yesterday surfing on Facebook I got this alert for suspicious file. The URL is from Facebook:

http://img834.imageshack.us/img834/7310/facebookculiao.jpg

And the URL who generated the alert: hxxp://www.facebook.com/diagnostics/lb/get.php/lbtest .

I’d like to know if this file is really an infection or just a false positive (judging by the infection name seems like it was detected by heuristic) …

Hi, FCx!
yes, it was a false positive and it was already fixed in 121221-0 update
https://www.virustotal.com/file/6cd83776213f7cc5cd6c3764539fb351d0ceefc9bfa3ae57da6c45dea468770b/analysis/