Just stumbled across this on Facebook.
Like pizza capers Facebook page, then follow the instructions below (taken from their page)
I wasn't able to post to their page so sent them a PM and they still honoured it.
Gets you one large free pizza.
FREE PIZZA
Snap a selfie of your best “OMG FREE PIZZA Happy Face” and the Pizza Capers team & Tracker Tracker will give you a FREE PIZZA!
Simply post your selfie to the Pizza Capers Facebook wall here: http://tinyurl.com/z2fujfo (One pizza per customer.)
Check out Tracker Tracker on a live mission here: http://tinyurl.com/jm4tutm #getabetterpizza
love favenook