I consider participating in Less Wrong an excellent example of this.

How so? I find it to be a great use of learning time, my learning rate on this site is as high as almost anywhere. In fact, it's one of the very very few sites that I get somewhere close to the signal:noise ratio that I would with an excellent book. I've learned a lot from here, especially Eliezer and Yvain, but really everybody here has good perspectives. The community is shockingly intelligent and focused on a topic that's really important...