Renren.com

I remember when I graduated from high school, everyone was filling out each other's yearbooks. I thought it was too much trouble, and since everyone would change their addresses and phone numbers anyway, I didn't bother. Then, after graduation, I went to an internet cafe with a classmate and saw him open the school's intranet. That was the first social networking service I ever saw. In the era when BBS forums were all the rage, this…