Who doesn't like getting something for free? I certainly l do. So do a lot of folks. That's why there's no end to the number of contests people can enter online. It seems like every other day I get emails notifying me that I've won some sweepstakes or another. I've even been the "lucky winner" of sweepstakes and contests from places as remote as Ireland and China (even though I've never been to any of those places and sure haven't entered any of their sweepstakes).
Of course I'm not alone. Millions of people have received the same emails, which are generally scams to dupe people out of their money. I ignore those emails, but many people don't.
There are a lot of legitimate contests and sweepstakes sponsored by all kinds of companies and organizations. About.com has a comprehensive listing of contests. I've also won a couple freebies in the past. That's why when I saw an ad on Facebook that said "Win a Wii Fit," I clicked on it to see if it was legit.