People like to challenge each other to crazy things on video. The most famous example is the ALS Ice Bucket challenge - but there are also lots of others, such as the Cinnamon challenge and the Salt and Ice challenge.
People share these challenges all over the web, but it’s very ad-hoc - you watch a video on facebook, upload a response on youtube, share it on twitter.
Challengr builds a platform on top of Kik to let people create and participate in these challenges.
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