Since it has more than a billion members, it only makes sense that hackers and scammers would target Facebook. People spend hours on the site and reveal all sorts of private information. That only makes a criminal's job easier.
Based on information you've probably posted, a scammer could steal your bank information. They could even recreate your Social Security number or load your computer with a nasty virus. These are the dangers you face every time you log into Facebook.
It's unlikely that you want to close your Facebook account. That's fine, because you don't have to. You just need to know what to look out for to stay safe when you're using the site. I know a few ways to have all the fun with none of the security risks.