[bemmu]

If I learn something short and interesting I'll sometimes post it on /r/todayilearned and get a conversation going around that. Minor difficulty is that you need to link to something, and unless it's a web article the post won't succeed, but that's usually not hard and you end up learning more in the process.

Actually sometimes you even start to doubt what you've read when it's hard to come up with a second source. For example I read in "Broca's Brain" that Thomas Jefferson refused to believe in meteorites, but could not find a second source.