This is something I haven't completely gotten yet either. The thing is, don't ask for questions, make content that begs a question or a comment.
This is hard, on account your content IS a comment. All art is, regardless of medium. So how does one make their content about something and also incite conversation.
Well, a good way to do it is subtlety, but the problem with subtlety is that it doesn't bring in views. So you have to have something broad that you can insert subtlety into. Subtlety is not a marketing point but it is a conversation starter.
We have a lot of tools and they'll all eventually make sense.