It looks like each page a user navigates to is appended to the URL. I hope the team develops the notion of "browsing modes" with the option (on by default I would think) to use canonical URLs for a given page. Otherwise, a user trying to visit a bookmark at a later date will (1) wait for all prior pages in their browsing stack to load before the page they bookmarked, and (2) may potentially exceed a maximum URL length depending on how that particular wiki is served.