Twitter announced Tuesday that it will begin to hide all tweets from some accounts in conversations and search results. The goal is to identify and filter trolls and harmful users, based not on any specific tweet, but on how they use the social network holistically. The new effort is part of Twitter's two-month-old initiative to discern what it means for the platform to be "healthy." Previously, Twitter mostly looked at the content of individual tweets to decide how to moderate them.

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