If you own your own company, then good for you. You are the king of the office, manager of your own time. If, on the other hand, you are just an employee of some other company, then too bad. I know that you may get bored because of the monotony. This does not give you the right, however, to waste company time.
Every minute from the time you arrived to the time you logged off, you are paid. You are paid by your company to be productive and work. You are not paid by your company to linger around the comfort room for hours, play music on your headphones (though I doubt if you have the guts to put on a large equipment on your ears), or open your Facebook or My Space account. Do you not realize how much money does your company lose when you are being unproductive? What if there is an important call from your desk that you have to answer when you are doing something wasteful? Will you compensate for the potential loss?
Time wasted is money lost as they say. When you waste your company's time, your company loses big bucks. Be considerate. You are given enough lunch and coffee breaks to do what you please.
In the end, of course, no words from anyone will make you realize what you are doing. It is all in your conscience and ability to put yourself in others' places. I am sure, once you have your own office and hire a lot of people, you won't be pleased when you see them toiling around instead of doing what they are ought to do.
(I know a similar post was already made before. I am just trying to remind you yet again.)