Yup. I've heard of IRC. It's like Mary in Mary Had A Little Lamb. When it's good, it's very very good, and when it's bad, it's awful. See signal deeply buried in noise, above.
As for information dying in wikis, too true at this point. I'm arguing that's what we need to fix. Have one place, on Wikipedia for instance, called Linux How-to, that we (i.e. us *nix users) all settle on as "the one how-to to rule them all," that has paid (gasp!) editors to curate it. We all add our nuggets of wisdom to it, but there are editors to keep the currently relevant signal on top. And it should be organized with a nice clear For Beginners tutorial we can point beginners to, and every distro can point to their subsection in their first-use screen. We're a community. We can do this. (Hah.)