The social media site continued to bring in new users, but its ad revenue didn't measure up to expectations. Twitter shares were down 18 percent at the close of trading Tuesday.
Before today, a Twitter user could send direct messages only if the recipient was one of the user's followers. Now there's an option that would allow users to message anyone on Twitter.
Researchers at Purdue are using software to mine tweets for data that can help warn that a dangerous storm is approaching. But the data may not always be reliable and analyzing it can be tricky.
It's hard to know when to take violent language seriously online. But when Jonathan Hutson saw an anonymous threat to an unnamed school on Twitter, he couldn't let it go.
Football is the most watched sport in America — and increasingly, one of the most controversial. If you were the NFL commissioner, what one thing about the sport would you change?
It was an honest mistake. But when President Obama said "James Flacco" when referring to James Franco — on a Friday before the holidays, no less — the slip was eagerly received online.