A Dutch movement has started called '99 Days of Freedom' in response to Facebook's recent experiment in how its changes in the News Feed content can effect users' moods. 99 Days is an experiment to see what impact there could be on our moods if we left the social network altogether, and already in the last few days 21,800 have joined in.

It has been well-documented that younger users of Facebook are beginning to switch off, so the 99 Days experiment seems to hit a raw nerve with many.

You can take part if you like by signing up on the 99 Days site here, and if you'd like to see some of the reasoning behind the project from its creators, the write-up on PSFK is worth a look.