Answer:
Yeah. There is lots of cool stuff. There is Club Penguin. Its where your this 3D penguin, and you walk around and make new frends. Its very safe, and the writing is stricked. Theres Webkinz, you can type your own messages using Kinzchat +. (not that good, but i like it!)
These are both very kidish.
I am under 13.
I still play on both of these.
However, ther is weeworld, myspace for kids, juniotwitt, and fbf kids.
FBF kids is the best.
That last 4 is much, much older. Its not the safest, but it is the funest! ;)
Hope I helped.
Ps. On Weeworld, no picture is allowed.