Now all those people who said Facebook was a waste of time and hurting productivity are only half wrong.

Facebook may be the single biggest detriment to the gross national product because of the hours people spend updating their status and telling all 611 friends that they have to pee, but it now provides you a chance to win a trip to Mexico.

The Mexican Tourism Board has created a Facebook Giveaway trip to Cancun.

Here’s how the giveaway works. Become a fan of “We Visit Mexico” on Facebook before Dec. 28th and you become eligible to win a 4 day, 3 night trip for two to Cancun.

Like many businesses, the Mexico Tourism Board wants to draw more people to its social media sites — hell, we’d do the same thing — but we don’t have tickets to Cancun.

Also, if you’ve been to Mexico — and every American should go there at least once every two years — you can post your photos on the We Visit Mexico flickr, twitter and youtube sites as well.

And when you’re done with all of that, go join our Facebook page too.