Pagination instead of Infinite Scrolling
I think Infinite Scrolling (the current system) is not a good idea, because it increases the page memory with each load at the bottom of the page and it could lead to browser crashes.
Another disadvantage of Infinite Scrolling is that you can't reference an specific part of the post stream by URL, so you can't bookmark it (a big disadvantage of AJAX)
I think the classic pagination number system is the best option. For example, the stream URL would look like this:
It's easier to jump on big intervals of pages.
Another idea is adding a switch (on your settings page) where you can choose between infinite scrolling or pagination system.
For more info, you should read this: