Facebook applications

So there are like over one thousand facebook applications and there are probably just as many spam applications too. what i don't get is how an application like that can be published. i mean isn't there someone who actually test those to make sure that they don't contain a virus or something? if not, maybe there should be someone who does, and not only tests for that but also tests to make sure that the application is legitimate and that is really does what it ways. i mean there are tons of applications where they say you can send free gifts to member who play different games on face book but they don't do a damn thing. all they do is make that person mad and get them even more frustrated. i recently tried using one of those to find out that it was spam. how can spam applications be allowed to be published? i mean everything that you create on face book has to be approved first, so how does something like that get approved in the first place?