If you enter a lot of Facebook sweeps, this is a must-read:

From Consumerist:

Like so many other people, I never checked the 'other' tab for my Facebook messages. I assumed that if anything wound up in there I would see a number pop up notifying me, much like my normal inbox. Fortunately a friend alerted me to the fact that this ISN'T the case, and I went in to find hundreds of re-routed messages. About ten were relevant and not spam.

One of them was a notification that I had won second prize in a contest I entered online, relating to the Blu-Ray release of a major motion picture. This included a new flat screen TV, blu-ray player and a copy of the movie. Oh, and it was dated from August 2010.

I emailed back and of course was notified that since I hadn't responded it was awarded to the next runner up. Though I question why I received a Facebook message and not a call or email, they can run their contest however they want, and the bottom line is I lost out; all because Facebook can't be bothered to tell me when they've put a message in 'other'!

Source: Consumerist.com