A sign hangs on the door of an office at Reddit headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) 

Reddit mascots are displayed at the company's headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) 

A sign hangs on the door of an office at Reddit headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY TPX IMAGES OF THE DAY) 

Reddit programmer Keith Mitchell works in his office at the company's headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) 

A Reddit mascot is shown at the company's headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) 

Reddit employees work at the company's headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) 

A Reddit mascot is shown at the company's headquarters in San Francisco, California April 15, 2014. Reddit, a website with a retro-'90s look and space-alien mascot that tracks everything from online news to celebrity Q&As, is going after more eyeballs, and advertising, by allowing members of its passionate community to post their own news more quickly and easily. REUTERS/Robert Galbraith (UNITED STATES - Tags: BUSINESS SCIENCE TECHNOLOGY) 

A combination of screen captures show websites Wikipedia (top L), Google (top R), Mozilla (bottom L) and Reddit during their online blackout protest against proposed legislation on online piracy January 18, 2012. The companies oppose bills designed to curb access and payments to overseas websites that traffic in stolen content or counterfeit goods on the grounds that it could put them in legal peril. REUTERS/Staff (UNITED STATES - Tags: SCIENCE TECHNOLOGY BUSINESS CIVIL UNREST POLITICS) 

A reporter's laptop shows the Wikipedia blacked out opening page in Brussels January 18, 2012. The blackout scheduled for Wednesday to protest against proposed legislation on online piracy has failed to get the support of the biggest Internet players. Despite calls for the participation of sites such as Facebook, Twitter and other big names, the biggest participants are the online encyclopedia Wikipedia and the social-news website Reddit. REUTERS/Yves Herman (BELGIUM - Tags: BUSINESS CIVIL UNREST SCIENCE TECHNOLOGY)