Chess Stack Exchange is turning 10 years old this quarter, so it's time for
a big party an entry in Stack Exchange's quarterly anniversary blog post! As you can see, we'll be getting a paragraph describing our site and community, together with one or a couple of interesting questions.
We (the moderators and staff) know you'll come up with some ideas about this; please post them as answers to this question, and vote on submissions by other users. To make voting easier, please nominate one interesting question per answer. Ideas for the paragraph are welcome as well, in a separate answer (which can be edited/commented on by other users). Otherwise I'll try to draft one in the coming week (and post it as an answer as well).