the facebooks like to recommend you treacle posts that might pique your special interests _just_ enough to keep clicking: listicles, repacked tumblr posts, poorly-edited historical-interest articles probably cribbed from wikipedia
when they strike me as fun, i end up going to wikipedia for more ;) and sometimes you find a fun error: i saw a plane history feed today showing what looked like a photo of a test flight of an aircraft of which in fact _they never built the prototype_