Facebook's Mark Zuckerberg isn't one to take no for an answer, so when his company's attempts to buy messaging service Snapchat fell on deaf ears last year along with the failure of the Poke app, it was never going to be the end of the story. Now it's being reported that with Snapchat going from strength to strength without Facebook's involvement, the social network is hard at work bringing its own video and instant messaging app to the masses.
