Hey, here's something really stupid and annoying: Facebook abruptly switched everyone's default email address to the @facebook.com account you've never used. Here's how to switch back Facebook's obnoxious overreach right now. So people can actually, you know, contact you.
Luckily, it's easy to reverse this foolish move. Go to your Timeline. Click about, under your contact info. Scroll down to "Contact Info" and hit edit. Switch all of the crossed out circle symbols to a full circle for each inbox you want visible on your profile. If you don't want @facebook.com to show up, switch it from a full circle ("Shown on Timeline") to crossed out ("Hidden from Timeline"). This is also a good opportunity to check your privacy settings and make sure your various inboxes are visible only to friendlies. Hit save.
Facebook: don't do this again