Twitter aims to deliver you the best of what’s happening in the world right now. This requires a recommendation algorithm to distill the roughly 500 million Tweets posted daily down to a handful of top Tweets that ultimately show up on your device’s For You timeline. This blog is an introduction to how the algorithm selects Tweets for your timeline. Our recommendation system is composed of many in

Twitter Text Editor is a standalone, flexible API that provides a full-featured rich text editor for iOS applications. We use this for Tweet composers on Twitter for iOS. Today we’re happy to share Twitter Text Editor so iOS developers outside Twitter can add robust text editing to their applications. Why Twitter Text Editor? Text editing is one of those common tasks in iOS applications which look

Don’t you love to crank code? As developers, we love to refactor; we love to be productive. As managers, how can we let the coding cowboys on our team be free, while maintaining code quality? At Twitter, we’ve been experimenting with feature testing. There are at least seven teams doing some form of feature testing of their services. Some of these teams have even discarded most of their single cla

Infrastructure Testing Twitter.com: achieving reliable test results at scale Love it or hate it, testing is a vital part of any software development cycle. Since it would be highly undesirable for buggy code to be deployed to the millions of devices accessing Twitter. Twitter.com has thousands of unit tests and nearly a hundred integration tests. Integration tests, also known as smoke tests, allow