I think YouTube definitely qualifies, though the content hosted there is much more heterogeneous in quality and purpose. The how-to content alone is its own lit

I think YouTube definitely qualifies, though the content hosted there is much more heterogeneous in quality and purpose. The how-to content alone is its own little wikipedia. Guided by videos, my mother is now diving into home-improvement projects that she would have relied on my dad for in previous decades. My dad has always been handy, but now he's learning to do things to professional standards instead of the improvised, jury-rigged way he's always done them.