Facebook and MySpace get most of the mainstream attention, but social networks focused on various niches can help you connect with people more effectively. One of those niches is sports.

Although sports-centric social networks aren't nearly as popular as general social networks, their uniqueness garners a loyal, passionate following. If you're a sports fan, joining at least one of these social networks can be rewarding.

Sports social networks

ArmchairGM ArmchairGM gives you the opportunity to support your favorite sports teams and talk about them with others on the site. Using collaborative wiki technology, it lets you write articles about topics that interest you, comment on others' articles, and go to the "Locker Room" to discuss sports topics with other fans.

Unfortunately, ArmchairGM's design isn't very compelling, and its community is smaller than that of some of its competitors. But it's still a good way to connect with rabid sports fans.

ArmchairGM lets you blog about your passion.

(Credit: Screenshot by Don Reisinger/CNET)

FanNation FanNation is a