With over 300,000 members, the site primarily targets and presents race results for swimming, running, cycling, mountain biking, triathalon and adventure racing.The social network side of it is that it can be used as a tool for athletes to connect with other competitors and enthusiasts in their local area.The site not only markets itself as a social network, but also as a dating site.
Integrated with both Facebook and Twitter, a Nobii allows you to shelve, find and share books.
It's hardly likely that all your friends will be on there, but it seems like it could be a good opportunity for both personal and business relationships.
Aimed at competitive endurance athletes, Athlinks promotes itself as the largest results database for endurance athletes.
Having only launched in 2010, Audimated is a relatively new platform.
It is a social networking site for independent musicians and their fans, offering a platform on which both artists and fans can sell music and related products to make a profit.