Kenenth Cole is one of the first brands to offer a Google Glass app. The app, 21 Days, 21 Deeds, challenges users to do 21 good deeds in a three-week period, using Glass to take photos as proof.

Users are encouraged to use the hashtag #manupformankind and post the photos on Twitter. But as Creativity Online points out: you can as easily take the photos with your smartphone or camera and post them on Twitter.

So far, the movement has been slow, because there are only about 10,000 to 20,000 Glass 'explorers' in the world right now.