"I use 'nerd' and 'geek' interchangeably — I don't make a distinction. I've said that being a nerd is not about what you love, it's about the way that you love it. So you can be a nerd for football, and obsessively follow stats and player trades and figure out things that give you an advantage in, like, sports betting and things like that. Or, you can love Battlestar Galactica and try to work out all of the complex mythologies and get into things like blueprints of the ships. And then you can love things like Agents of S.H.I.E.L.D. and Winter Soldier, and love that so much that you end up going to a comic book shop and then reading all the way back through ten or twenty years of Captain America comics. Someone who I would describe as a 'geek' or 'nerd' is a person who loves something to its greatest extent, and then looks for other people who love it the same way, so they can celebrate loving it together."
-- actor/blogger/writer Wil Wheaton, defining for GQ a word we'll see and hear bandied about a lot -- a lot -- during Comic-Con International