This is a very comprehensive site that not only allows you to do all the other social networking stuff like uploading pics, cyber-befriending people and updating your status, but also has such features as an easy-to-use online training diary, supplement store (with some of the best deals you’ll find anywhere), competitions and a large exercise guide database with pics and video demonstrations. Despite the address title, you can be assured that this is a site for all-comers from beginners to advanced, from obese to skinny. Visit bodybuilding.com.