The user expectation is that if you refresh the page, you will see fresh content.
if i refresh the page it should be almost the same. maybe a couple new things at the very top, but i should still be able to find the thing i was just looking at.
by comparison, facebook auto-reloads while you're halfway down a page, and wont show you any of the same things. its an incredibly poor experience
At the very least we should be able to scroll backwards after a page refresh to see previous posts.