rich 1.0 While he held hostages for hours in a nightclub methodically killing patrons, the gunman in last week's deadly Orlando shooting searched [f500link]Facebook[/f500link] to see if news of the attack was going viral, according to a lawmaker. Wisconsin Republican Sen. Ron Johnson, chairman of the Senate Homeland Security Committee, disclosed gunman Omar Mateen's social media activity in a letter to Facebook CEO Mark Zuckerberg. TIME's Top Stories https://audioboom.com/channels/3380207-time-s-top-stories Audioboom https://audioboom.com 480 95 https://audioboom.com/i/22565268/600x600/c 600 600 <iframe width="100%" height="95" src="https://embeds.audioboom.com/posts/4708467/embed?v=202301" style="background-color: transparent; display: block; padding: 0; width: 100%" frameborder="0" allowtransparency="allowtransparency" scrolling="no" title="Audioboom player" allow="autoplay" sandbox="allow-downloads allow-forms allow-popups allow-same-origin allow-scripts allow-storage-access-by-user-activation allow-top-navigation-by-user-activation"></iframe>