How do you deal with users posting duplicate topics?

How do you deal with users posting duplicate topics? The issue is two-fold.

1. most importantly, the question has already been answered, yet users are waiting.

2. a company might want to keep fresh issues on the homepage, and not have questions that have been answered before taking up space.

I seem to remember in the early days of GS, that when you posted a topic, it first suggested some possible responses. What happened to that feature?

Thanks!
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