Donald J. Trump emerged as the big winner on Election Day. There were some tech victors, too.

One Silicon Valley start-up, for example, got plenty of attention on Tuesday. The company, VoteCastr, said it could provide real-time voter turnout data that could accurately predict, throughout the day, how many votes the candidates received in each state.

There were hiccups in some of VoteCastr’s projections, Alexandra Alter writes. But if nothing else, the tiny company succeeded in getting onto people’s radar screens.

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Then there was Twitter, the social media service where much of the presidential campaign played out over the last year. (Remember Mr. Trump’s early-morning tweets?) On Election Day, conversations about voting and results immediately took off on Twitter, with hashtags like #ElectionNight and live streaming video about the election, conducted in partnership with BuzzFeed News.