Periscope was not that first, and initially it was not the best mobile live-streaming service But it may be the social video broadcast platform we remember. Owned by Twitter and rushed out the door in response to upstart Meerkat's instant rock-star status at South By Southwest 2015, Periscope looked like a better-designed version of its competitor, but with curiously different functionality (comments on Periscope don't post to Twitter, for instance).
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