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Is there any way to do this for Instagram / Facebook / Pinterest?

This seems like it could be super useful.

We've solved it for Instagram: https://socialcull.typeform.com/to/QvznoL

Not really. Their APIs are super-restrictive. Also, their terms of use are another thing altogether.

on the twitter front, is there a good way to get secondary influencers that are following a primary influencer and interact with that influencer on a regular basis?

You can achieve this for a few accounts with the Twitter API, but due to API limits, it is tough to get it done at scale and make a product out of it. There are creative ways of achieving this, though.

Point in case: take a look at how Nuzzle works for Twitter accounts. It is very close to what you are asking for.

thanks for suggesting Nuzzle, I had not heard of this before.

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