I put a URL from the community into the gogole rich results test. Here are the results:

I don't know what effect rich results testing has on SEO. Is this very important?
A link test on the Discourse forum:

A link test on the Flarum Forum:

I was hosting nodebb on startupmachine.co earlier and everything worked fine
now I have moved it to forum.startupmachine.co and my facebook SSO started failing.
Facebook gives error:
Internal error.
Oops! Looks like something went wrong!
/auth/facebook/callback
Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request
I replaced site URLs with forum.startupmachine.co everywhere
I am using EC2 Ubuntu with nginx
EDIT: google and twitter are working
sorry for late reply
it is :
http://forum.startupmachine.co
I tried lot of things for redirect uri
could u tell what should I enter
here are settings which I have kept
appdomain: startupmachine.co
site_url - forum.startupmachine.co
redirect_uri: forum.startupmachine.co
but i tried lot of things in all of these fields (spent a whole night with all combinations )
same here:
Internal error.
Oops! Looks like something went wrong!
/auth/facebook/callback
Error validating verification code. Please make sure your redirect_uri is identical to the one you used in the OAuth dialog request
dev-version @ master. I tried also all sorts of combinations, my url is http://forum.x4dojo.org and I entered http://forum.x4dojo.org and http://forum.x4dojo.org/auth/facebook/callback as valid redirect urls.
@Macrow-Willson , ah setup: apache,debian,mod_proxy