Source: Strava Blog

The Signal: In February this year, exercise and fitness-tracking app Strava hit an impressive milestone. The company reported that 50m+ athletes had joined the platform and collectively shared 3B+ activities since its launch in 2009. A third of those activities were shared in the 13 months prior. 

For the numbers nerds out there, Strava adds 1m new users every month who upload 4m+ photos every week and 20 activities every second.