Okay, let me get this straight? You sent out a Press Release for teens? To a standard news site, hoping Teens that would register for your site, might find it and login?
If you are looking for exposure, it's a great idea. If you think you're going to drive thousands of teens to your site with a Press Release. I think you've overestimated the power of PRWeb or any othe
PR related site.
If I was you, I would have spent my money on ads for "myspace" as a keyword in Google and the such. I think you might have garnered a little more tuned traffic that way.
Or, buy keywords that are the hot searches for teens right now.
Or, figure out how to optimize your site for that type of information.
You are going to find it quite difficult to compete with MySpace unless you set yourself apart in some way.
Perhaps focusing on a certain group of teens. With similar interests and the such. Then I think the site will make you more of a success.