Information collection site for the government??? Unless you're the KKK, Black Panthers, Bloods, or Bin Laden - you have nothing to worry about. If your page is one of the mentioned, then yeah, the government might be taking a look at it.
Any website can be used against you. If you confessed to a crime here, on facebook, or on your own email, it makes no difference. You just say your were a liar and made it up and you're fine so long as there's no more evidence against you.
Facebook used to be a social networking site for college students only but has since branched out in the last few years to the general public.
It's the same thing as the popular myspace and similar to this new site called Twitter that's been in the news a lot as the next big thing.
It's a good way to keep in touch with people and find people you used to know.