Things that say you can get something nifty (like an app that shows whos looking at your profile or something), all you have to do is join the group and invite all your friends. Then something is supposed to happen and you get your app. This is a real problem on facebook, because people are generally idiots.
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What are the obvious cons that you already know. I don't want this to be a big time waster for me giving you the obvious cons.