Bring the thunder! Support our Thunderclap campaign and let everyone know that you are going to #gmm14!
Thunder-what? Thunderclap is a crowdspeaking platform, an online flash mob if you will. It allows people to automatically share the same message at the same time on Twitter or Facebook. So are you excited for Graspop Metal Meeting 2014? Bring the thunder and let everyone know that you're going to #gmm14!