“And the winner is… Periscope.” That was Twitter CEO Dick Costolo during the Mayweather-Pacquiao fight on Saturday night. And he could be right. There was an endless stream of Periscope users endlessly streaming live video of their own television screens. That could set up a fight that actually lives up to the hype — the one between Twitter, the second screen partner of TV, and Twitter, the first screen app trying to kill TV. (Down goes Frasier, Down goes Frasier.)

+ Fortune: The very big fight for the small screen.

+ Tim Wu: The dreaded bundle comes to Internet TV