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Branch—a startup created by two Twitter cofounders—hovers in a space between a private, lengthy e-mail thread and a public stream of tweets.
As the social networking companies try to make more money, they may become less friendly to outside developers.
The dominant social networks cater too much to advertisers, says the man behind a Twitter-style network that users would pay for.
Using software bots to repeat messages, supporters of the presidential candidates are pioneering underhanded Web tactics.
The surging social-media response to TV promises to shape future programming and advertising trends.
Tweets and other social media comments are about to drive real-time changes in programming.