I am 14 now and my mom is still thinking about if I should have a Facebook or not! Should I and Why please?Thank You!

That would be completely up to your parents as they control your access to the internet and therefore Social Networking sites, like Facebook.

What else do you do online ?

There is no reason you "need" to be on Facebook, but it can be nice to "talk" to family members you might not get to see very often, or with some of your close friends.

It is important to remember that there are people online who pretend to be someone different. They may pretend to be a teenager when they are an adult for example. IF your mom does decide to allow it, be sure to only "friend" people you actually know in real life and are good friends or family. Mom should also set the privacy controls so that no one can bother you and cause you any problems.

I think it's a good way of keeping up with family and friends... people you don't see often or are to far away.

However, this is your parents decision,they will control the access to sites like these, until they think that they are safe for you to use, under their supervision.