Web
The timeline has become a ubiquitous part of our user experience. It started with Facebook and Twitter, and now Pinterest and the Google+ interface have given us a new take on the same concept: display a list of items to the user. As they scroll down the page, add in the next batch of items. Sometimes those new items are added automatically (ala "endless scrolling"), and often there is a "push to load more" button, like in Instagram's new website.