Social engagement requires more than posting information about your product or service. You need to look for ways to be helpful to people without trying to drive them to your site. Look for opportunities to build relationships first and foremost. Once people see that you're helpful they'll begin ...
I'm not a lawyer but I've dealt with similar matters in the past. Technically the author of the post, but you as the publisher you can be liable for the content specially if you don't publish the original credits.
Have you thought about social media (i.e. twitter?) I rely upon twitter for feedback on a regular basis. Another option is to create a targeted list of the 500 people/organizations you specifically want feedback from and send out via email, though as we all know the response rate on something lik...
That sort of idea was most successfully implemented by a company called Quirky.com (https://www.theverge.com/2015/4/24/8488531/quirky-invention-powered-by-quirky). Quirky got a ton of investment and grew very quickly. I had meetings at their office several times, and it was a really fun environme...