Big Brother is watching me?

I have always been paranoid about posting information about myself online. However, today it is almost impossible not to. These days we spend a lot of time on our computers; the Internet has become an important part of our lives. Personally, I rarely speak to my friends by phone, I e-mail, message and facebook them instead and I see a great advantage of it!
While using the Internet, we have to be smart about what information we give away. I have always thought that the Big Brother is watching us. Just take Facebook for example. Just by visiting my profile, someone can know who I am, where I have been, whom I know. They can see all kinds of pictures, read some personal messages on my wall. When accepting a friend, I must confirm how I know him, where and how we met. Who needs all that information?