I held out on facebook until 2006ish.  When Facebook first came out it looked like the interface was horrible, so I kept to Friendster.  Friendster was sweet, then Myspace came out and I reluctantly made an account the month it came out.  Friendster went down hill and I jumped to Myspace, same thing happened again and now Facebook is on top.  I use it daily, it's a fun way to keep in touch with friends.  I also made an account on Google+, but I like the Facebook interface better, who knows the same fate may come to Facebook as it did to Friendster and Myspace.