Live video platforms Ustream and Justin.tv both launched in 2007 and quickly drew users who wanted to broadcast their days to the world or stream live events like concerts. Justin.tv was later folded into TwitchTV, the video-game streaming service acquired by Google last year for $1 billion. Ustream is still open to anyone, but is largely focused on corporate clients who use the platform to power some of their own live-streaming efforts. (Facebook is one of those corporate clients.) A convergence of factors have led to the rise this year of apps like Meerkat, YouNow, and Periscope, which announced last week that it has 10 million users who watch more than 40 years of live video per day. – Caitlin McGarry, Macworld

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