Twitter was created to log every thing you do and every step you take. These Ramblers also do just that--except in a more literal way.
Rambler shoes track your speed and pressure while walking and Bluetooths these signals to your phone, which then sends it to your Twitter account as tweets. More pressure = “Step”, less pressure = “Tap”, and “...” is the time lapsed in between.
Necessary or not, die-hard Tweeters will definitely chase after these kicks (and then tweet about it).