MediaCore uses a popularity ranking algorithm similar to Reddit's.
The popularity of a media item is described by: log_x(media.likes) + media.age/y
Where:
x (the base of the logarithm) is the "Popularity Decay Exponent"
y is the "Popularity Decay Lifetime"
media.age is the number of hours between January 1, 2000, and the time the media item was published
media.likes is the number of likes the media item has received
Essentially, in this algorithm, a media item (A) that is y hours older than media item (B), will need x times as many votes as (B) to rank at the same level.
Lower traffic websites will want a higher y value, or a lower x value, or both.