Serious privacy risks.
Better read this article first: http://torrentfreak.com/pirates-expose-their-download-habits-through-trakt-141130/
Very good site. The two admins who handle the site are constantly updating it with new and useful features.
This website has the capability to become very big in the next few years. I hope they do, because this website is unique there are no others like it and the design is very good.
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Track what you're watching. Discover new shows & movies. Automatically scrobble from your media center and check in from your mobile.