Between work and free legal clinic, I joined this odd facebook thing. It's interesting. I hope that I discover, somehow, everyone I ever knew but lost track of and said "I wonder what happened to.....".
I never see these social networks as in competition. Livejournal is like that friend in high school or college to whom one wrote long, long-hand letters about personal philosophy and inner doubts.
Myspace is like that bulletin board on the college campus where you posted the ads for people who wanted to buy your used bike or share your hobby, and snipped little tear- away phone numbers in the margins. The only problem with it is that people keep posting "for a good time call" spam over the best ads.
Ebay and Craigslist are what pennysaver papers used to be, writ nationwide.
Twitter is what those cute girls used to do in 7th grade, and you never understood them or it then, but you wished, a little, you were as cool as them.
Deadjournal is that guy you knew in high school with a fascination for switch blades who secretly loved pets in a saintly way, more than life itself.
Dmusic is what happens when band geeks grow their hair long and then have children.
Youtube is a lot like those talent shows where everyone sang and danced in community follies.
Deviantart is those kids in 10th grade art class who could make the most amazing things, but then spent all their time setting up cliques to worry about quality control. Just like back then, some of the most self-satisfied painters mix sparkle into their oils.
Google is the best friend you talked about the meaning of lyrics with.
Wikipedia is you, in third grade.
You never graduate high school, really, you just keep increasing the grad(ient)e.