Motley Fool (http://boards.fool.com/) used to have fairly intelligent forums. I haven't really hung out there since the Dot Com days; just checked and there are some interesting postings.

I fear that the big socials like FB have crowded out the traditional forums. People just don't have the time for all of this, so they default to the low hanging fruit.

There are a few interesting suggestions in this HN topic; will check them out as time allows.