Yeah but doesn't help him with issues like this. And so do the mods of course.
And hey, I am a stalker what can I say.
But Discourse uses a system called OneBox for these amazing link magics. If it doesnt work it usually means either your browser is too old/incompatible or some kind of security plugin/antivirus thinks its bad news.
I personally recommend Google Chrome or its nicer newer little brother, Vivaldi.