Facebook friend?

So recently I've been spending a bit of time on Facebook and I've been getting a lot of new friend invites from people from ages ago. It's quite strange finding out that someone you once knew from Year 1 remembers you from school. That's nearly 20 years ago!
Also I've noticed a lot of people who I knew from my high school, have also added me as well. (Facebook has probably implemented a new friend finding system).
Anyway, I wasn't really the most popular person in school, but it's strange how the people you never speak to adds you as a friend, it's crazy to see how people turn out too, I mean I don't think I've changed my since I was in school, but it seems like everyone is a different person now. People are starting new lives and even making new ones! Maybe I need to make a start at actually doing something with my life?

When I was younger I thought that my best friends from school and I would keep in touch for years to come, but now we hardly talk. Its strange how things never turn out as you'd expect them too.
I wonder how long before the "friends" I know now will forget about me? 10 years? 5 years? Tomorrow?