You can set the hours during which the test will affect you, as well as which social media sites it will block. Facebook, Myspace, Twitter, Flickr, YouTube and Tumblr are included by default, but you can also add a custom URL (in case you want to avoid posting drunken comments on your favorite tech blog, for example). The tests themselves are quite amusing, and based on real roadside sobriety tests. Follow the finger with your cursor, or you can't post, and Social Media Sobriety test will post for you, telling everyone you're too intoxicated to post right now (which, in some cases, might be worse than whatever you were actually going to post).
Social Media Sobriety Test is a real extension, but there's a reason it sounds a bit like a joke. It's a stunt by computer security firm Webroot, who created it to make the point that "we protect you from everything, even yourself." Well played, Webroot.