Neopets was the thing. I originally had an account when they first started up which was right around when I was in middle school. But then ya know, you get older and get busy and I forgot about it. Then I was introduced to it a while ago and I have an account but Ive lost interest in it recently. I go back to check every once in a while.

My very first pet site was Neopets.
Now I have an account on just about every pet site out there.
You name it, I can tell you yes or no. If you see dragoness129 on the site, it is me.
The list is so very long and diverse, I cannot list them all. But if you feel like asking, just name some, I will let you know. ^_^