Also important to differentiate between infinite scrolling and lazy loading.
Infinite scrolling - you never (or almost never) reach the bottom of the page. It always expands and loads more items as you get near to the bottom.
Example: Twitter, Facebook
I generally dislike it on most sites.
Lazy loading - the images only load when the user scrolls to that part of the page. Saves bandwidth and makes the page faster. Pages with lazy load are not necessarily huge.
Example: QZ.com, click an article and scroll to the bottom
I generally like it if executed properly.
It can be easy to confuse the two, since infinite scrolling sites utilize lazy loading. But a site with lazy loading doesn't need to have infinite scrolling at all.
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