5by

5by was a video discovery and recommendation app founded by Greg Isenberg in Montreal in October 2012. Describing itself as 'your video concierge,' the app recommended online videos to users based on mood-based categories such as 'Geeking Out' and 'Music Lovers,' learning from user actions to refine recommendations. The six-person team was acquired by content discovery platform StumbleUpon in September 2013 — StumbleUpon's first-ever acquisition — for an undisclosed sum, with the entire team relocating to San Francisco to continue developing 5by as a standalone product. StumbleUpon ultimately shut down the 5by service in December 2015.