Here's a really nice project I worked on with io recently. It's Ireland's first ever, Twitter-led, office-based fitness programme.
Instead of a Christmas gift, we created this light-hearted regime to help clients lose a pound or two in January.
A new exercise was posted every day and clients were notified by email or by following on Twitter.
The campaign was so successful that even the arch-slacker Spencer Pratt was following the campaign - proof enough that that guy really has nothing better to do...