Twitter

In simpler times, jurors were told not to discuss their cases with others. But with the proliferation of mobile devices, courts must now contend with Facebook, tweets, texts, instant messaging and Google — all tools that can compromise a juror's impartiality.

The Associated Press, NPR and the BBC have all had their Twitter accounts hijacked in recent weeks. Hacks of high-profile accounts have real-world consequences, and the security at Twitter is coming under increased scrutiny.

It quickly became clear that the "news" was not true. There had been no explosions at the White House and President Obama was fine. But a message on the wire service's Twitter account rattled investors.