Believe it or not, Facebook and Twitter aren't the only cool social networking sites on the Web. If your kids are too young for Facebook, or you're concerned about privacy, consider looking into some lesser-known social networking sites geared for tweens, preteens, and yes, even teenagers. We've rounded-up some of the top social networking sites that allow kids to keep a tighter rein on their privacy. Our choices include sites that limit the ways you connect with friends, offer greater control over how you interact, or home in on specific interests. Some of the sites for kids on the younger end of the scale offer more parental controls, too, so you can have a better sense of what your kid is doing online.