At this time, Edgar supports Facebook, Twitter, and LinkedIn. Instagram has a closed API and their terms of service prohibit automated and recycled posts from services like Edgar. If they change their policy in the future, we will certainly revisit whether Instagram is a good fit for Edgar.
For a detailed look at why Edgar has not added Instagram, check out our blog post about just that: http://blog.meetedgar.com/will-meetedgar-support-instagram/
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