I would say the BB BBS is definitely a left leaning bubble, although a rather big one. But I don’t get my news from Boing Boing. I know people who literally only get any of their information about what’s going on in the world from Facebook. Now, that’s not Facebook’s fault, but the reality is these people are getting a massively skewed view of the world because they are only seeing things their like minded friends post. I’m aware Reddit works differently, but I’m not sure it’s any better. And a leftist Reddit may not be leftist only, but how many honest, serious conservatives do you think will visit that site for thoughtful, calm discussions with people of a different ideology? My guess is a number sufficiently close to zero as to be indistinguishable from it.