I like the sites that give you a button at the bottom to add content on click (like Facebook). Automatic perpetual scrolling introduces several glitchy usability issues in some browsers. While using a scroll wheel works well, using the scroll bar becomes dicey. Dragging a scroll bar down on a page makes the bar jump and jitter because it continues to resize the page content. Also, clicking below the scroll handle on the scoll bar to 'page down' can often jump more than a page because the browser is recalculating the size of the page (seen in Firefox Mac).
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