This past weekend saw a wide area infection from a spam posting that encouraged users to view a video. I've warned users in the past to be VERY wary of any video's that look suspicious such as these. One of the best applications you can install to help prevent these posts from hitting your wall is defensio.com. It will block these posts as well as malicious content included in facebook e-mails. I highly recommend every facebook user take the precaution of installing this application. Details on the adware infection can be found:

Thousands of Facebook users hit by video attack, Sophos reports