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I have no real idea how this works, does the site somehow know when you've 'seen' a post, or does it know how many posts there were when you last looked at the page?
The site keeps track of the timestamp of the last comment on a page of comments. It knows you have "seen" up to there.
But... if a new comment is 20 comments down a page, and comments higher have inlined images from slow 3rd party servers... then when you arrive at the new comment, it may be pushed down the page by the loading of images higher on the page.
Velocio
Why is it that sometimes when I revisit a thread, I'll be taken back to a post I've already read before?
I have no real idea how this works, does the site somehow know when you've 'seen' a post, or does it know how many posts there were when you last looked at the page?