[bjacokes]

I go to https://www.reddit.com/r/bikewrench for bike maintenance Q&A. The responders there are often extremely knowledgeable, although it doesn't have the article structure of Sheldon's site.

[c0nsumer]

I frequent that subreddit as well, but one needs to be very careful to navigate the cargo-cult very very wrong "solutions". Some of these sound right on their face, and thus get parroted, but don't really work out.

[bjacokes]

Any examples come to mind? This is true of most Internet communities but I've actually found that one to have more informed opinions than usual.