I'm building a website for an app I'm creating, and I'd like the website to have a forum for beta testers to highlight bugs, discuss issues, and offer suggestions. Ideally it would be good to allow the user to download the (Android) app, register (via Facebook/Google+/their own email), and then that would automatically give them access to the forum area of the website. I think the forum will only be available to testers, so other website visitors wouldn't see it.
So, step 1, I'm looking for a good, up-to-date forum plugin. The ones I've found so far seem to be several years old, so most would pre-date Cake 3.0.
And if anyone could give me any advice on whether this is a sensible approach to take, that would also be welcome - if not, is there a better way to do things?