Serendipity35

I wasn't sure myself. It's the kind of question you need to ask some millennials.

So far, I have gotten these answers:

1. They enjoy the idea of creating alternate identities. It's not so different from creating an avatar to be in a role playing game. New name, new life, new whatever you want. Very appealing.
2. Having large numbers of friends/buddies/contacts. Hundreds, thousands of them. Not like real world friends, but in some ways better. Who doesn't want friends?
3. You can be a bit of a voyeur looking at other people's photos. It's like being able to sneak a peak into someone's diary - but you won't get into trouble. In fact, they are inviting you to peek into their dresser drawer.
4. With sites like Facebook.com, you can check out other kids in your high school or college without them meeting you. They see this as "safer" not "dangerous".
5. They like being able to populate their space with hip content - even if it's not their own creation. You can create a video yourself and post it - but you can also link to professional content. Fame by association?
6. They like using sites like "What's That Code" which provides web page code and has a large collection of music videos for you to paste into MySpace, Xanga, Friendster, a blog or website. Pick an artist, pick a song, copy the code, paste it in and it creates a link to the video.
7. Guest books are so web 1.0!