To add to this... I also made my account sometime in 2006, right after you didn't need an .edu anymore. It was a great platform, because it combined my friends, photos, and events.

So I could find out about an event, go and meet people, and then find them later in the photos and friend them. It snowballed very quickly, and it helped that I was really into photography at the time. It really was the perfect social platform for me at the time. It contributed greatly to my life.

For me, the main motivation to stop using it and eventually leave was all the frontend changes that made the website clunky and tedious to use. It used to be a joy, and now it's just... Well, IYCSSN... Even m.facebook.com, and many of the features are broken on it.

I deleted my account a year or two ago, after a couple of failed attempts, since there was a 14-day cool-off period before they would actually "delete" your account.

I recently made a new one just for keeping up with a couple of event spaces, but that's basically all I do on it. That, and I friend all the spammer accounts that send me requests, because, why not? The more the merrier. I'm pretty sure that's where most of the growth is coming from at this point.