I would say that freeriding is not being pinned down to one discipline. I, for instance, ride a Fireeye Spitfire. Its a DJ/Park bike, but even so i don't just ride park or dirt jumps. Sometimes(quite often) i like to go down to the woods near where I live and hit some drops, or shred some deer trails. True freeriding is not just big mountain stuff, fair enough that is how it started, but there is a whole genre of Urban Freeride aswell? Freeriding is just going out and doing whatever you want to do on a bike, aslong as its big. :)