Obviously everyone knows what YouTube is by now. It's without a doubt one of the most popular sites for teens. But what about younger kids? If they're dead set on going on here, it would be best to watch them. Even if they are just going to watch an upload of a Dora episode they missed, some of the videos that come up on the front page are inappropriate. I can just imagine a curious kid clicking on one. The comments from other users can be seen on all videos. Some video uploaders don't allow comments, and there's also a button to hide them. But if you have an older kid who's planning to join YouTube and comment as well, be warned - there's A LOT of heartless users on there who use intense swearing and are just genreally rude. Lots of stupid "cat fights" occur in the comments also, with tons of cursing. Not only are the comments a problem, but so are the videos. Like I said, you can watch your kid or give them restrictions on what they can watch...but I have had a personal experiance that made me realize how unpredictable this site can be. Now, I did use to think that YouTube was a perfectly fine site as long as your kid didn't look up porn videos or something wacked like that. But one day, at my aunt's house I saw my twin 9 year old cousins were on YouTube. I came over to see what they were watching, and I was shocked. Apparently they had looked up videos about "Elmo kills Barney" or something like that. The video they were watching had Elmo trying to shoot Barney. I just thought, at the time, that this was just harmless. A little weird, but still harmless. Then I heard Elmo yell, "Shut the f*** up!" to Barney and then he started cursing up a storm. My cousins laughed and didn't seem bothered by it. I thought about just switching off the computer, but then they did anyway when my aunt called them for a snack. Then I realized that people can so easily stick a curse word or other inappropriate stuff into a video where you'd least expect it. I'll admit I kind of did see it coming in the Elmo video, but once my friend and I were watching an Animal Crossing video and the guy playing the game started cursing and having a fit. Oh, and guess what I heard one of my cousins say the other day? The F word. Hey, Elmo said it, right? *rolls eyes* I once even read a comment on some other forum (months ago; I have no idea what forum it was now) that once this one person discovered YouTube, their innocence was shattered and they learned about the "birds and the bees" shall we say. So, while Youtube had a lot of good videos, some educational even, it'd be your best bet to supervise a kid under 12.