I think it would be fun for littler kids, but watch out for the messaging.
Well, I made an account and I got bored of it within 2 mins. When I was on there, you could type stuff like "butt" and other things not too bad but could hurt little kids feelings. I guess it would be pretty educational if you play educational games on there. I would say it's boring for me, but I'm 11. For 7+ ages I would reccomend. Littler kids than those ages, would probably get offended or sad about the rude messaging that a smaller sibling, or friend might be worried about. If your 5, 6, or even 7, I think go on KidsCom.com with a parent/gardian so they can supervise you (your kid).
What other families should know
Too much swearing