How many dont use this?

[[TC]►BP◄]

I don't really know anyone who doesn't use Facebook.

Like a lot of things, using FB is a good thing as long as it's in moderation.

If you spend your hours playing Farmville instead of getting stuff done, then FB is a bad habit. If you use it regularly to keep in contact with friends or family for free then it's a powerful tool which the vast majority of people with internet access use.