Maximouse
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About where the url would take you, I think it would probably take you to a new page titled "Unread Topics in [Forum Name]", with all the new topics you haven't seen that were created since the last followed forum message. Then you can click on them and check them all out. If not this, then it would probably redirect you to the page with the oldest new topic, where you would still have to find it yourself… or there could be a new indicator for this…?I think it should open the page with the oldest new topic and highlight it.
short: what the url would take you to is not yet clear.