Power
Age: old - new
Age: new - old
Power/Age ("Trending"): consider the age = 0 case. Does this devolve to basically sort by age?
upvote/view ("Hot"): Easy to manipulate if we don't define "view" appropriately
upvote/downvote ("Performance"): consider the no downvote case
For all of these consider that they might result in many way ties.
Power Age: old - new Age: new - old Power/Age ("Trending"): consider the age = 0 case. Does this devolve to basically sort by age? upvote/view ("Hot"): Easy to manipulate if we don't define "view" appropriately upvote/downvote ("Performance"): consider the no downvote case
For all of these consider that they might result in many way ties.