VIDEO: Digital foot race between real-world strangersActivity trackers linked to social media are enabling strangers to compete over who has walked or run the most steps. The result can be real-life weight loss.
Source: VIDEO: Digital foot race between real-world strangers (http://www.bbc.co.uk/news/magazine-22684770#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa)