It's a really bad idea to add your home or cellphone number to your Facebook page. Prank callers, stalkers, scammers and identity thieves would love to use this information against you.
Post a picture of your recent vacation or major new purchase and this puts you at risk. Think for a moment of all the terrible things that might happen if some nefarious person knew your home address. Remove it from your Facebook profile.
Try not to leave any information on your Facebook that reveals where you work. If someone from your workplace tries to search for employees on Facebook, they might find a post or photo that they don't like.
Including your relationship status on your Facebook page just invites awkwardness. The number of "likes" that you might get from people after you change your status from "married" to "it's complicated" will creep you out.
Facebook is free, but it still wants your credit card number. Adding your financial information lets you buy gift cards and other products straight through the website. How convenient!