I wouldn't call FPH an echo chamber. I would call us a circlejerk  That's fair. I actually thought about the two, but thought starting my post with the image of us masturbating each other, howsoever geometrically, wouldn't set the right tone. In calling it an echo chamber, I imagined the sound,  as it were, coming from outside and bouncing around in here (with us all basically agreeing with other) until the next post/sound comes along - to no effect on anything outside of our chamber.