“Why Do So Many Music Venues Use Ticketmaster?” “What’s It Like to Train to Be a Sushi Chef?” “How Do Martial Artists Break Concrete Blocks?” If you were looking for answers to such questions 10 years ago, your best resource for finding a thorough, expert-informed response likely would have been one of the most interesting and longest-lasting corners of the internet: Quora.
Before Quora it was yahoo answers and it was just as shitty as Quora. The only Q&A sites that are not a waste of time are stackoverflow and other stackexchange sites.