Technically he didn’t shoot first, ONLY han shot, greedo didn’t get a chance to do anything. 😛 There was only one shot.
I’m so tired of hearing this semantic argument - Han Shot First sounds much better as a phrase than Han Was The Only One To Shoot and it’s not semantically wrong at all, because when two people are about to do the same thing, one of them has to do it first and whether or not the other one does it second or doesn’t do it at all, the first one still did it first.
@Moviefreakedmind: I’m sure you wouldn’t be breaking any rules by posting the link if you clearly said that it may contain TFA spoilers 😃