I don't use facebook...if I want to keep up with a friend I call them and make plans to see them or at the very least send them an email to make plans soon.

You will make different friends at different stages of your life. There will always be a few that will be there for many, many years/life stages and others will move in and out. It's just how life is for everyone; it says nothing about you.

I think Facebook is not a true measure of friendship...it's not like you have a real connection with these "friends"...they are just some number on a web site a guy is making a ****load of money off of, partly based on our insecurities.