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I think it would depend on how often you check the front page. If you are looking at it a couple times a day 5 is plenty. If you only look every few days then 10 or more is more useful. Could it be scaled based on the last time a person checked? So if I come back in 2 hours say, I'll only get 5. If I come back in 3 days I'll get 15 for example.
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