it falls off the front page because NEWER content is being promoted. it's still promoted, its just a few pages back. you add articles 1 2 3 4 5 6 7 8 9 10.
assuming it takes 3 votes to get promoted, article 3 gets 2 votes, 7 then 8 then 9 get 5 votes each. 3 gets another 2 votes.
your front page will look like:
3
9
8
7
ie: 7 got promoted, then 8 got promoted, pushing 7 down. then 9 got promoted pushing both down, then 3 got promoted, finally, and pushed them down.
now, that is NOT the only thing determining placement, i belive there is a value of how "hot" the story is at the moment.
and NO, to answer your second question, this is NOT run as a cron, it's done live, everytime a client requests it.
Regarding:
Quote:
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I take it karma should be calculated BEFORE promotion right?
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this is true, but like I said in your other post, karma dosent DO anything. right now it's JUST a number.