Quora is a platform where people ask questions and other users provide educated, in-depth answers. It sets itself apart by the quality of the answers provided, which are usually quite elaborated and made by experts. The 3D printing topic is quite active, with a few top users providing the bulk of the answers. Savvy marketers often use Quora to build their online reputation on a given topic. Note that questions on Quora are not often from 3D printer users but more from people outside the 3D printing field asking general questions, so if you got a question about your clogged extruder, maybe that’s not the best place to ask.