As far as the teens go, yeah, I wouldn't let the kids have a myspace. Of course the response is "All the kids are doing it." I heard on the local news that 960 kids from one high school were. I understand kids wanting to use the networking, as the adults do, but they don't realize what privacy means. They seem to think it's like their diary, only that the whole world can read including perverts. They seem to give all kinds of personal details that shouldn't ever be given on the net. Perhaps a solution would be to only allow people under 18 to access websites of people under 18. If a guy lies about his age to get into it, arrest his butt. Not sure how you'd enforce that though. I do agree though that parents need to be aware of their kid's actions as well, instead of leaving it up to the government to pass laws that they can't enforce, but sound good politically.
As a webmaster and artist, I have a small annoyance in MySpace is that the kids on their tend to hotlink to images on my art site because they like the artwork. Now, thus far it's been pretty low bandwidth wise (and I'm on a 1000 gig BW server which only uses like 10 gig a month (not mine, but a place I freelance for). So that doesn't bother me that much. I'm not going to and hassle a teenager about taking it down. I just would rather it not skew the results of the stats. Otherwise I wouldn't much care. There is one advantage though, I get to see how they are using it and I've really liked some of the applications. I didn't know there were horse/stable RPG's before this. Just wish they would a> ask permission, b> download the images after doing so rather than just hotlinking, but too much to ask I guess. You know if they did that, I might even be willing to put up a link section just for them.