Okay, thought I'd mention it because it's had such a significant effect for me. So that possibly means that in my case the Auth0 <-> Instagram connection is something to investigate further.
Usually the idea of a hackathon is you make something in a short period of time. Because you can start now, before the event has started, really it's "Hey developers, please make some stuff with our API and then come and show us on the day of our conference". Or have I got this wrong?
It's a good point that you can't be responsible for the things that people who recommend you say online.
The idea is that you'd share the link privately just with people you really trust, so it's unlikely someone you don't trust would add their recommendation. I agree - you probably need to be able to remove any recommendations that you don't think are appropriate...