Friendly on Facebook

We've been told by many to be "careful" on Facebook... try not to swear, don't post inappropriate pictures - basically, present yourself as a classy person. However, there are instances where people aren't acting in a classy way on Facebook, and they don't even realize it. After reading the 13 Facebook posts that got people fired, it immediately makes me relate to people I know. More on the occupational side, I know some of my friends complain about their jobs and customers on their Facebook, whether it be on their status or on someone's wall. This is a little frightening, because employees are on Facebook, and we're naiive in thinking that they don't check up on us. Reasons like this are why I am getting sick of Facebook. People post trashy things on their walls, and it's not benefitting them in any way, shape, or form. They need to realize that when people say, "you post something on the internet, the rest of the world sees it", it's true.