Themes: Social MediaTwitterThe Great Big Walk15 walkers, 21 days, 5 routes, 1 mission... get behind The #GreatBigWalk teams making their way across the UK https://t.co/nupIPODt1Y pic.twitter.com/DmijQjNQJh — Fitbit UnitedKingdom (@FitbitUK) May 27, 2017