While viral videos are a common feature of modern Internet life, recently a few audio clips, including sounds from a comet, have become popular. Underwood & Underwood/Corbis hide caption

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John P. Elwood, attorney for Anthony D. Elonis, speaks to reporters outside the Supreme Court in Washington, D.C., on Monday. Elonis says he was just kidding when he posted a series of graphically violent rap lyrics on Facebook about killing his estranged wife, shooting up a kindergarten class and attacking an FBI agent. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

In this undated photo released by the Girl Scouts of the USA, Girl Scouts Bria and Shirell practice selling cookies on one of two new digital platforms. It's the first time the organization has allowed the sales of cookies using a mobile app or personalized websites. Girl Scouts of the USA/AP hide caption

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At his trial, Elonis argued that he was only exercising his First Amendment free speech rights, which he also says he wrote on his Facebook page. iStockphoto hide caption

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German Chancellor Angela Merkel uses a mobile phone during a meeting of the German federal parliament in Berlin, on Nov. 28, 2013. The country's labor minister supports a call that would prohibit employers from sending emails to employees after normal business hours. Michael Sohn/AP hide caption

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International Space Station Commander Barry "Butch" Wilmore holds up the first object made in space with 3-D printing on Nov. 25. NASA hide caption

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An employee demonstrates how a mother is checked for sound quality before it is duplicated during production at the Rainbo Records factory in Canoga Park, Calif. The vinyl record industry has seen an uptick in sales in recent years, keeping manufacturers like Rainbo busy. Patrick T. Fallon/Bloomberg via Getty Images hide caption

itoggle caption Patrick T. Fallon/Bloomberg via Getty Images

This Nov. 19 screenshot shows the cover photo of an unofficial Marine group on Facebook called Just the Tip, of the Spear. The group and those like it have been accused of promoting sexism and of acting as a forum for hate speech. Just the Tip, of the Spear - 21/Facebook hide caption

itoggle caption Just the Tip, of the Spear - 21/Facebook

Computer Engineer Barbie is shown at the New York Toy Fair in New York. Critics took issue this week with a book that portrays Barbie needing help from boys in order to make a video game and fix a virus. Mark Lennihan/AP hide caption

itoggle caption Mark Lennihan/AP