Internet Sites For Discussing Economics

I find dispiriting the inability of most mainstream economists to discuss economics. Here are some emerging sites:

• Research Gate has a part set aside for economics.
• Stack Overflow has some proposed topics. (Apparently, mathematical economics occasionally comes up on Math Overflow.)
• Economics Questions apparently uses the Stack Overflow software.
• Quantitative Finance has its own Stack Overflow site.
• The Test Magic forum for PhD applicants in economics has been around for awhile.

Off topic: Matt Rognlie, who strikes me on first perusal as unjustifiably arrogant, casually dismisses Modern Monetary Theory.