As always the key to technology (or to any other tool, for that matter) is to use it wisely.
Most of us are capable of using Facebook wisely. I use it to keep in touch with relatives and friends whom I might not otherwise have time to keep in touch with. It provides a way for me to quick update friends/family on new events in our lives. It’s a good, quick way to distribute pictures of the kids and family to those whom we want to send them.
Are there people who use FB irresponsibly? Sure. But there is no reason that those of us who do use it responsibly should be banned from it because some people can’t handle it properly.
In short, the answer is not banning, but education.
The Wolf