A lot of ideas a duplicates of already submitted ideas. Presumably, people didn't know someone already suggested a similar idea. Expecting to search if a similar idea exists is not fair expectation I think - takes too much time.

Solution: Search for old ideas as when people try to submit new ideas. This is exactly what Google Groups does.

This is how it works:When you try to submit a new idea, a column opens up automatically on the side indicating "Have you looked at these ideas?"

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