A ponytail, braids, a bun, pin the front of your hair back somehow, or, when you put your hair in a ponytail, take the top of it and use a bump it or something and then you'll have a little poof too (: 

Yes there is, Facebook, Myspace, Fbfkids.com (which is like a myspace, just for kids), hi5, plaxo, but I bet there are many more.