YouTube provides embed links, and we allow html in posts so they happen to work just like other links, etc., with no extra "weight" on the site, since the video is fed from youtube. We're not actively trying to incorporate social media feeds, since this is really not meant to be a social media interface, and that would add far too much moderation load to our awesome moderators. If Instagram offers embed links, then it may very well work the same way, but it's not something we are able to add to the forum ourselves.
Thanks for understanding.
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