I personally won't address the ranking system by now, for that's a whole beast that might use some holistics and doesn't really have to be perfect by the day but at least fair enough in its long term tendency. That tendency could have random noise added and would still be cool. The problem is scoring based solely on single day activity, which is very discouraging, because that ensures an overall negative tendency in both ranking and rewards in the long therm if not cared by the day, which is tiresome and haves the negative impact of forcing interactions and engagement which can take a toll in the long term and end up causing the opposite effect: repelling stackers from SN.