Twitter has clarified its policy on "Copypasta" or duplicate content by limiting visibility of tweets.
Limiting the visibility of Tweets means that they may not appear in certain parts of the Twitter product, and/or may not be recommended or amplified by Twitter. Some of the ways we may do this include:
making Tweets ineligible for amplification in Top Search results and on Trends;
not recommending Tweets in timelines of users who don’t follow the Tweet author;
downranking Tweets in replies; and
excluding Tweets and/or accounts in email or in-product recommendations.
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help.twitter.com...]