Facebook founder's said initiative would help refugees access aid and maintain family links.
Founder Mark Zuckerberg said the button would be a way for people to express empathy.
Video urges action against spate of anti-immigrant hate messages on social media.
Content to include in-game highlights from pre-season through Super Bowl 50.
Company will open portal allowing any mobile operator to offer service under its Internet.org platform.
Traditional TV networks are recruiting Internet personalities to build audiences.
Facebook opens Johannesburg office as it looks to add to its existing 120M users on the continent.
Dick Costolo had been under pressure from investors unhappy with the firm's user growth.
President Barack Obama quickly amassed a multitude of followers to his personal Twitter account.
The social media giant announces it will allow more websites to join "free mobile data" plan amid backlash.
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