text: Riff lets you film videos and uploaded them to th e app. Friends and strangers can then film relevant clips and attach them to the end of your video . Despite being launched on April Fool's day, and using an #AprilFools hashtag to promote its features, Facebook's latest app is reportedly not a hoax. Called Riff, it lets you film videos and upload them to Facebook and the app. Friends and strangers can then film relevant clips and attach them to the end of your video to create a collaborative project. The app was created by London-based developers through Facebook's Creative Labs. It is available for free on iOS and Android. The app's homepage has a row of Featured clips, each tagged with a certain topic. For example, one tagged #balancingact features six clips in total and includes a dog balancing a banana on its head followed by a skateboarder, and a woman balancing books on her head. Each video has a counter that shows how many clips are attached, and which clip in the sequence the viewer is currently watching. It also shows how many people have viewed the total project. Individual clips can be reported for inappropriate content, for example, by clicking the menu button in the top right-hand corner of a clip and clicking the red whistle icon. Elsewhere, videos can be shared on social networks, over email and in messaging apps. It doesn't reveal what the maximum number of clips in a project is, but each clip can be no longer than 10 seconds. The app's homepage has a row of Featured clips, each tagged with a certain topic. For example, one tagged #balancingact features six clips in total and includes a dog balancing a banana on its head followed by a skateboarder, and a woman balancing books on her head (pictured) To start a video, users click 'Start new video', choose a topic (left) and press the arrow. Videos can be filmed multiple times until the user is happy with the result, and then the clip is uploaded. Each video has a counter that shows how many clips are attached and how many people have viewed the project (top right) To start a video, users click 'Start new video', choose a topic and press the arrow. Videos can be filmed multiple times until the user is happy with the result, and then they are uploaded. All videos are public. Each video has a counter that shows how many clips are attached, and which clip in this sequence the viewer is currently watching. It also shows how many people have viewed the total project. Individual clips can be reported for inappropriate content, for example, by clicking the menu button in the top right-hand corner of a clip and clicking the red whistle icon. And to start a video users click 'Start new video', choose a topic, and press the arrow. Videos can also be filmed multiple times until the user is happy with the result, and then they are uploaded. All videos are public. 'Having fun with friends is at the heart of the Facebook experience,' said Facebook in a blog post. 'Our hunch was that if you could make videos collaboratively, the creative process would be more fun and the final product would be cooler. 'Today, we are introducing Riff, a creative tool to make videos with friends.' Once a friend adds a clip to a video, a user's friend’s friends will also be shown the video in Riff and will be able to add to it. 'The potential pool of creative collaborators can grow exponentially from there, so a short video can become an inventive project between circles of friends that you can share to Facebook, or anywhere on the internet, at any time,' continued the blog post. If it is a hoax then it is an elaborate one that Facebook has continued for longer than April Fool's Day.
target: Riff was developed in London and is available on Android and iOS .
  It lets you film a video and uploaded it to the app and Facebook .
  Friends then film their own clips and tag them onto the end of your video .