There is a campaign afoot to encourage people to quit Facebook for 99 days. This is in response to the social network's controversial emotion experiment.

If you wish to join the campaign, just visit the website and later you can report back on how the hiatus affected your mood. The campaign website will send you "happiness surveys" at the 33-, 66-, and 99-day marks. There's also a message board through which participants can anonymously share how the break from Facebook is affecting their lives.

Art Director Merijn Straathof, of the website Just, said: "Like a lot of Facebook users, many of us were bothered by reports of secret mood experiments. As we discussed it internally, we noted an interesting tendency: Everyone had at least a 'complicated' relationship with Facebook. Whether it was being tagged in unflattering photos, getting into arguments with other users, or simply regretting time lost through excessive use, there was a surprising degree of negative sentiment.

"Then someone joked, 'I guess that the real question is, 'How do you feel when you don't use Facebook?' There was group laughter, followed by, 'Wait a second. That's a really good question!'"

3,267 people have committed to life without Facebook for 99 days.