Want to quit Facebook but don't have the willpower? Maybe very publicly announcing you are signing off for a couple months will do the trick.

To help you do so, a Dutch ad agency named Just is starting a campaign called "99 Days of Freedom, asking you to quit Facebook for 99 days and measure whether or not it makes you happier.

The campaign is pretty simple. Step one is changing your profile picture to one that says "99 Days Of Freedom." You can download this image from 99 Days Of Freedom's website:

Then you can create a personalized countdown and share it on Facebook. Once you share your countdown, the clock starts ticking down on your own personal little webpage. Here's what that looks like:

Then you just agree not to go on Facebook for 99 days. It's just a pledge: The 99 Days website has no way of keeping track of whether or not you visit Facebook. Odds are you will still check it every time you're in the bathroom.

You can also sign up to participate in the project's happiness survey, letting the people in charge know if you're feeling any better without Facebook.

The ad agency seems to be capitalizing on Facebook's controversial mood experiment. Scientists at Facebook published a paper at the end of June in which they revealed that they had played with almost 700,000 Facebook users' News Feeds to see if they could alter peoples' moods.