Wifi Access in Exchange for a Facebook Like

I was at the gym recently and wanted to use their wifi, since my workouts are dependent on Spotify and punk rock in equal measure. A few taps on my phone, and it became obvious that the price for using the gym's wifi was Liking their Facebook page. 

I hadn't encountered this particular scheme before. I'll admit, I thought it was fiendishly clever. 

I assented and thus became a fan of theirs on the 'book. Marketing triumphs again. 

These are my gym kicks, by the way.