primary purpose is definitely a Q&A site, but some questions do result in extended 'debates'. There are unofficial off-shoot groups where users of this site gather (myself not included) for more informal chat. Nothing really strict about it, just use common sense - post questions in the most appropriate category, use the automatic search facility to make sure your question hasn't been answered before, make your question's title relevant and specific and abide by usual netiquette (no ALL CAPS, etc) and you'll be fine. Just don't ask about tasty tasty very very tasty