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by Balgair 1958 days ago
The FAQ doesn't have a specific entry about comment rankings, but I'd guess it's based off a similar system as the Stories rankings:

"How are stories ranked?

The basic algorithm divides points by a power of the time since a story was submitted. Comments in threads are ranked the same way.

Other factors affecting rank include user flags, anti-abuse software, software which demotes overheated discussions, account or site weighting, and moderator action."