ShowHN: I built a Reddit.com Realtime mashup

That was quick! But... it's not working here. What I meant was, instead of just the title, also output a snippet of the linked page (similar to what Facebook does when you post a link).

Could be that your connection is a bit slow. It preloads the images (in order to fetch width & height) before it renders them. On slow 3G connections it could take a minute. I advice you to use wifi. Does it work after F5?

Perhaps you could preload the content but not push it into the page. Then provide some kind of a visual indicator that new content is available. A slider on the side of the page that grows with the current position moving down the bar as more new content is available. You could then push that content into the page as they scroll up from the current position. This gives the user the benefit of knowing that there's new content available without the page shifting around the content they are viewing.