I posted a question a while back asking for Derby tutorials or screencasts, or any helpful material regarding the topic.
The question was promptly closed as "not constructive". Unlike other questions that were basically the same (on different subjects).
Over the past year that question received > 20 upvotes and was favourited multiple times. There was a discussion going on in the comments as to why the question had been closed.
Answers to this question would obviously have benefited other people besides me (I have long since decided not to use Derby).
A couple of days ago, a comment popped up that basically stated: "We can all turn to Quora, where this question has been answered".
Surprisingly, the question has now been deleted altogether.
Coincidence? I think not.