In all of the (short) history of the Internet, there have been advertisements in various forms. Popups, splash screen, headers, sidebars ...you name it..
Personally, I have come to a point that I hate ads. I am searching for an article and there are more ads than text! To those of us that still using Facebook (I know that I must stop my bad habits :P ) for whatever reason and do not want to have that side bar of advertising... this is your solution. You will need:
What it does is use CSS and xpath selectors to "catch/select" the sidebar element (also known as the ad div) and it hides it. After you install it you don't have to do anything. It just hides the ads.
Besides Facebook, there are GreaseMonkey scripts that hide ads from many other sites. The best source for these scripts is here:
P.S. Sorry ad people :) I do understand the need to monetize but sometimes you do it too much!