[marknutter]

I agree it should be done well, but I don't agree you always need pages. For instance, when I use google images, I'm usually just looking for a few specific images in a sea of pictures and I don't care too much about keeping my place in that list. I care a lot more about being able to quickly scan through a very large grid of images, though, which infinite scrolling allows me to do.

[s_henry_paulson]

The one caveat here is, if you're going to use infinite scrolling. Don't have links on the bottom of the page!

Sites like Facebook do this, and I have no idea why.

Want to "Create a page". Well there's a link at the bottom. But if you scroll to the bottom of the page, it's going to load more content and push the link down.

I just tried it, and the page reloaded 15 times before I gave up... never did get to the link.

[isnotchicago]

On the right sidebar, under "Facebook (c) 2012" should be duplicates of all of the links at the bottom of the page. For the "Create a page" link, you have to click "More".

This is clearly unintuitive, but at least it exists.

[J0415]

Its probably there just in case scroll detection breaks. Some browsers - specifically BlackBerry browser (v4.6 to 5.0) - support AJAX lazy loading but don't support the scroll event.