Dumb people on your own side

I’ve been spending a lot of time on Twitter lately. This tweet does a lot to explain why:

I’ve found a number of people on Twitter with whom I agree on one issue or another. While I don’t intentionally follow any “dumb people,” most people who tweet more than a few times a day will occasionally say dumb things, and virtually all of them sometimes link to deeply ill-considered articles by others. So that site gives me a regular dose of bad versions of things I believe.