GetGlue for iPhone and iPad [iTunes Link] are social networking sites where you can let your friends know what you're watching, reading, playing, or thinking about. Similar to FourSquare and Gowalla, you check in to show your friends what you're up to. You can also leave reviews on pretty much everything and people can then like your comments or let you know if they find them helpful. As you check into things, you can earn stickers for your favorite items. You can also choose to have those stickers mailed to you once you collect 7. Click through for more screenshots and another video featuring the iPad version!