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How 'bout "every time you vote on a link provided by someone you follow, that 'follow' is extended a set increment of time." Set "follow" for 2 months. If you share content that you follow, the clock gets reset as if you'd just chosen to follow that person. If you don't share content the clock counts down. No shares in two months? You no longer follow that person. 1 share after 59 days? You still follow that person for another 60 days.