Storyful Yamcheck

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Detects if a YouTube, Instagram, Vimeo, VK, or Facebook video or Tweet or Storyful story has been mentioned in Yammer.Storyful Yamcheck is a tool used in the Storyful newsroom to quickly find out if a piece of content on YouTube, Twitter, Facebook, Vimeo, VK, or Instagram has been discussed in our Yammer. If it has then it displays a blue icon in the addressbar. Clicking the icon loads the search page on Yammer.com.

This all relies on you being logged into your Yammer account in the same browser. The extension itself is unaware of your Yammer session, no login is required.

The source code is available here;
https://github.com/storyful/yamcheck