May be we can add a button to ask a previously asked question again to bring it to the top. May be some one else will be able to find it this time and anser. And it will be nice if a rule is put like a question can be "re-asked" only once in a week or so and a total of 5 times or so.. What you think?
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We definitely won't be doing that.
Here's what I recommend:
The downside of a "bump" button:
By having this be a simple, one-click deal, it becomes very easy for people to essentially keep their questions on the active list, without any real activity going on with them. This creates a vicious circle where many questions are competing for the active attention, as armies of us code monkeys are sitting there clicking the "bump" button over and over like hamsters in a lab experiment. I wish I could see the situation where that wouldn't happen, but let's be honest -- a lot of people want their question to receive a lot of attention, and if even only 1% of SO's user base did this, madness and chaos would still ensue.
Yeah, I have no faith in fellow humans.
How will this be beneficial to the community? It will lead to questions being reposted as exact duplicates, which will either be closed very quickly by the community (wasting the time of those who look at the question to answer it, then realise that it is a dupe), or the answers will be spread out too much rather than being collated in one place.
Instead, draw people's attention to your current question. There they will see answers already provided, which may give them a starting point (e.g. this kind of worked, this didn't work, etc.). For more information on how to draw attention to the post, see the link that Jeff and random have provided (How to get attention for your old unanswered questions).