First impressions upon setting up a MySpace page:
1) Ads, ads, ads!!! I didn't expect my own MySpace page to be so full of them! I'm told you can screen them out, if your browser is Firefox. Should you find yourself using MySpace much, that's a good thing to keep in mind.
2) The MySpace interface isn't intuitive, at least not if you're trying to figure out how to add a "Friend."
3) I'm disappointed by the heavy-handed emphasis on helping MySpace grow and make money. (See #1). The "Invite" tab turns out to be just a way to ask other people to start their own MySpace page, so that (warning, cynical remark ahead) they too can begin generating advertising revenue for the website. I don't disagree that MySpace should be able to make a profit. But I'm surprised by the degree to which that goal is apparent on my individual page.
4) It's very helpful to have someone personally show you how to use MySpace. I'll bet even most teens learn the basics of MySpace from one another, rather than puzzling it out on their own.
5) I now realize that my experience with Google Blogger has spoiled me. It turns out that not all popular 2.0 tools are as well-designed and user-friendly (at least for me) as Blogger, with freedom of choice regarding advertisements.