gistfile1.txt

The one thing I find questionable is the leaderboard thing
simply because what I see happening is the "old school" people are at the top and stay at the top forever
We'd need a means of doing it by month or something
but profile doesn't log *when* a field was altered and what the "diff" was
Which makes calculating such a thing tricky
And leaderboards that are the stale list of the same 10 people month after month don't actually achieve the motivation factor you're looking for imo
So I would prefer to de-couple these
As the profile field takes 8 seconds
But the leaderboard is a different question that might need more thinkering