I can't tell you how many "illegal" contests I've seen hosted on Facebook. This is a common way to increase Likes or engagement on your page however it can be the fast track to getting shut down on Facebook. If this happens you'd lose your likes, albums, Wall posts; everything. It's just not worth it. If you run contests on your Facebook page or are thinking about running one, it is crucial you are abiding by Facebook's terms. I know they can be confusing and are a little hidden within the platform, so here's a video from their Facebook Developers page that breaks down the rules. If you have a question about a contest you ran or are thinking about running, please ask me in the Comments section of this post.