daily knowledge: today, "pull down to refresh" is a ubiquitous gesture in almost all mobile and touchscreen UIs. this concept first appeared in a 3rd party twitter client called Tweetie. this client was developed by Loren Brichter and released in 2008 for iOS and Mac OSX, and was so good that it was bought by Twitter in 2010 to become the basis for the official Twitter app. Brichter worked at the company until 2011, and in 2013, Twitter was finally granted a patent on the gesture, which they promised to only use "defensively."
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