You can have a route with dynamic parts. For iron:router you find the documentation about it here. There are also other routers that you can find on Atmosphere.
Iād store the content in a collection (or even embed it in the users collection as a hashtable, where a token is the key)
then, Iād create a dynamic route, something along: ā/my-page/:tokenā, and utilize Iron Router to control access to it (i.e. checking the user id etc)
you might also allow users to add titles, and then use the titles to automatically generate permalinks to their finalized page
e.g. title = ācooking is funā -> permalink = ācooking-is-funā