I'm on all of them. IRC is by far my favorite. Kind of like HN. When someone is commenting on HN I automatically have more interest than eg Facebook vs. Twitte

I'm on all of them. IRC is by far my favorite. Kind of like HN. When someone is commenting on HN I automatically have more interest than eg Facebook vs. Twitter as the primitive experience of HN (Which I personally love) filters out a lot of "noise". There's great communities out there on IRC. Just head to #postgres on freenode and see how helpful they are over there.