According to a report, when users create a Riff video for the first time, they can tag a friend and make it trend.

The app is available on both iOS and Android mobile devices. It originated after last year's ALS Ice Bucket Challenge when people began posting videos of them upturning buckets of ice water on their heads in the name of charity.

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Josh Miller, the product manager of Facebook's Creative Labs said that the aim is to make these videos grow as big as possible to get as many views and as many clips.

Snapchat has a similar feature "Our Stories" that looks like an inspiration for Riff with its crowd sourced collection of photos and videos tied to popular events around the world.

Facebook 'logs' into sprawling, garden-roofed office in California

The 2,800-strong Facebook workforce has another reason to press the 'like' button: The social networking site has moved some of them into a 430,000 sq ft sprawling complex with a nine-acre roof garden in California, the mere sight of which could leave anyone out of breath – literally.

Designed by Canadian-American architect Frank Gehry, the new Facebook building, called MPK 20, houses sweeping murals and art installations.

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The works of about 15 local artists, including famous sculpture-maker Evan Shively, already adorn MPK 20 and more are to follow.

The roof of the new Facebook building, about 70 feet up, offers a winding walk through nine acres of greenery. This walkway sits above the marshlands of Menlo Park, California.