After a certain age you realize you don't have as many friends as you had or thought you had. It's called growing up. What facebook does is keep you in this adolescent state of thinking. That being said, I have seen people make important recollections that that they otherwise would not have been able to do.
I do however have multiple business facebook pages like this one
fyoungaction. Which I need to do more with. Hey if everyone else is doing it, why not.
Also cleo is right, but I'm using the DynaTac mobile phone.