StackSocial: Win DJI Phantom 4 Pro or DJI Mavic Pro December 27, 2016 // by webmasterJust complete the required tasks at StackSocial to get a chance to win DJI Phantom 4 Pro or DJI Mavic Pro, your choice! Prize DJI Phantom 4 Pro or DJI Mavic Pro, your choice How to …