Twitter launches video streaming app Periscope

(Reuters) - Twitter Inc launched a video streaming app called Periscope on Thursday, just days after reports that it had blocked a rival app called Meerkat. Meerkat relies heavily on Twitter and has become hugely popular in the month since its launch. Twitter's announcement comes on the same day that Meerkat unveiled a list of investors that included Silicon Valley venture capitalists Greylock Partners and Sound Ventures, Ashton Kutcher's fund.