If you go to a URL for a while and then go somewhere else, the URL appears.
If you go back to that that URL, the old activity item disappears because we only keep one copy of a URL in the stream (per person).
If you only go to a URL for a short time (<5sec) then we don't show it, because it was probably interstitial. If your second visit to a URL was short, then both that visit and the previous visit will be removed.
If you go to a URL for a while and then go somewhere else, the URL appears.
If you go back to that that URL, the old activity item disappears because we only keep one copy of a URL in the stream (per person).
If you only go to a URL for a short time (<5sec) then we don't show it, because it was probably interstitial. If your second visit to a URL was short, then both that visit and the previous visit will be removed.