Personally, although Facebook isn't the only window I open when first browsing, it is the most anticipated. Has anyone added me? Has that friend uploaded the photos of last night's party? Did that guy comment me back? Much time can be wasted pouring over event invites and conversations, keeping me up to date with my own little world and the people in it. Even the most trivial update of my friends television viewing habits are an opportunity to get going a conversation out of boredom, or the want to develop a closer relationship with the person by talking to them more often.
Can teens go on network sites too much? Of course, and by now the teenage population is bordering on obsessive when it comes to "poking" and marrying your best friend according to your info box. It has such a strong hold on teenage society, that it has become a joke in some respects, and has opened a gap for ribbing and parodying of its usage. An example is in a TeamFourStar's DragonBall Z Abridged episode on YouTube, where the quite serious character "Piccolo" randomly signs into MySpace because he's so lonely and bored training out in wastelands alone.
"Damnit I'm lonely. Might as well check MySpace"
"No new comments" 
"No friend requests. Damn it. Well at least I have you Tom- you're always there for me."
For anyone who watched Dragonball Z as a kid can see the humour behind such a stoic, friendless character social networking, when he lives in an empty wasteland and hates technology. The "Tom" line throws out a tid bit any MySpace user can appreciate, as we have all seen the countless profiles with the one friend: Tom. Unlike the character "Piccolo", one good reason a teen may have few friends on MySpace is because of it's rival: Facebook. With more applications and better ways to create events and tag photos, Facebook overtook MySpace in the social networking race, and gained more and more teens. I myself did the switch from MySpace to Facebook. Why? Was MySpace now inferior? To me, not really, but my friends seemed to believe it was "cooler", and of course, without friends to talk to anymore, MySpace had become an empty shell for me and therefore useless to its original purpose. Danah Boyd touches briefly on this, showing that teens are often on these sites because all their friends are there, and they're popular, making the social networking site profiles the Vans and Converse of the internet- if you don't have it, you're just not cool enough.
