It has become apparent that only the most recent five ideas stay on the homepage (except for Best Ideas, which ranks them). It is already the case that new ideas only last a day - if that long - before they are displaced from that box. I haven't counted how many are simply not available on the homepage.
Why not use dropdown menus for the title bars of each category? The dropdown would list all the ideas in that category. Then you could decide whether you wanted to visit that category or not. You would know what you might be missing without leaving the homepage.
You could do the same thing with a mouseover if having to click the dropdown seems like too much work.
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Without a way of deleting ideas, I suspect that this would swiftly become unwieldy.