How to have social media posts auto-populate a blog?

How do I configure a blog so that new posts on social media (specifically Instagram) will automatically create new blog/event posts?

For example, on this page, the events are created automatically by social media posts - but I don't know how it's done.

I'm interested in this as well, I'd love to know if you were able to find a solution. 

I was never able to find a solution. sorry.