Twitter has more than 310 million monthly active users who send hundreds of millions of Tweets per day, from all over the world. To make sure everyone sees the Tweets that matter most to them, we've been working on features that bring the best content to the forefront. We've refreshed the Home timeline to highlight the best Tweets first, introduced tailored content via Highlights for Android, and personalized the search results and trends pages.
The performance of these products depends on finding the most relevant Tweets from a large set of candidates, based on a product-specific definition of "relevant." From an engineering point of view, we view these as information retrieval problems where the documents are Tweets and the product is defined by a query. For example, to show you the best Tweets first in your Home timeline, we might first find candidate Tweets from accounts you follow with a search query like this one:
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