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Infinite scrolling also consumes a lot of memory since resources like images pile-up endlessly.

Compare that to a page-number navigation scheme where only the displayed resources on a given page are loaded.

Not everyone has a fast computer (or tablet).

There are ways around that, too. I'm sure there are better descriptions but just for example: http://engineering.linkedin.com/linkedin-ipad-5-techniques-s...

I hate flickr's infinite scrolling because of this. It's impossible for me to browse more than a few pages worth of images on flickr.

And of course flickr doesn't have any good tools for fine-tuning search results, so infinite scrolling is the only way to try and find what you want.