If a user posts a question which has potentially interesting answers but then deletes it themself, should the original poster be given credit if another user (who read the original question) decides it is worth reposting? One would not want to take credit for another user's idea, but we might also be cautious about naming that user since deleting the question may mean they no longer want to be associated with the question. Since SE sites do not allow direct messaging of users, one can't just ask the original poster.
This meta question is inspired by a recent question about the "speed of electricity" that was initially unclear, but after clarification it turned out to be perhaps worth answering. (Although the poster did not realize it, an answer to the final question would involve discussing how the rise time of signals in lossy transmission lines depends on the conductor's resistivity.) By the time I got back to it, however, the question had evidently been further downvoted and then deleted by the original poster. I thought about reposting and answering the question myself, which made me wonder how and whether I should acknowledge the original question if I ever get around to doing so. At the very least I would certainly say that it was based on a deleted question, so I guess this meta question is essentially about whether one should name the user who posted the original question.