James Franco's Instagram protestations show he doesn't get (or care) how the internet works

James Franco has turned his celebrity into something of a spectator sport — both wittingly and (probably) without meaning to — and David Letterman could have asked him about a lot of things on The Late Show Thursday night. He chose to broach the topic of Franco's Instagram account. (This is a thing? Yes: BuzzFeed is concern-trolling Franco about an "Instagram intervention" — don't click if you don't want to see a lot of James Franco.) Letterman showed Franco one of those photos — he's in...