User's timeline in the Web UI (work in progress).
Note the URL in the address bar. There is no page number in the URL,
before= parameter instead points to a moment in time. If new posts are added, the content of the page will not change, because it shows a fixed period of time.
It's a usual problem with forums - you look for a post in a forum, the search engine gives you a link, you go to the forum... but the post is not there, because new posts were added and all the previous posts were moved to next pages. We try to prevent this from happening in Moera. On the other side, the pages will not always contain exactly the same number of posts. But who cares?