OK, so…let’s make this one short and sweet. Asking questions is one of the most important things you can do in a language. You have to know how to ask questions in a variety of ways, depending on the social situation, the amount of knowledge you have, whether or not you give the answerer “response options” to choose from, and cetera.
The best place I know of on the Internet to get that kind of action in Japanese is: Yahoo Answers! Or, as it’s called in Japanese, Yahoo!知恵袋/ちえぶくろ/Bag o’ Wisdom. There are all kinds of cool questions and answers there. The fun and variety of a forum, with the focus of something like Wikipedia (you won’t really find stoopid arguments there). From what I’ve seen of the American/English version of Yahoo Answers, the Japanese version is tons better, so I do be recommending it.
And, yes, I wholeheartedly endorse Yahoo Answers for sentence-picking…There may well be errors on it, but (1) they’ll be native errors (2) a dictionary lookup will easily iron most out (3) those things that you’re still in doubt about you can either look up elsewhere, or just not add to your SRS.
By the way, the way I typically search for interesting question-answer discussions is to type in something I’m interested in in the search box. I like to read about how people perceive different ethnic groups, so I often find myself typing in the names of those [is this social voyeurism? I don’t know…but it’s cool to have this feeling of reading something that wasn’t intended with you as its target audience].
Anyway, yeah, check it out.