The purpose of the retweet feature of Twitter is to credit the original person who said whatever it is you’re retweeting. Stealing a tweet is actually against the law, according to Twitter, and this is why they have no problem deleting infringing tweets, and even punishing the accounts. There is an account, @PlagiarismBad, which is dedicated to spotting infringing content, and notifying Twitter, who must then delete it.
But now Twitter is going further, particularly because it has no choice. Twitter replaces plagiarized tweets with a notice that the tweet has broken copyright law. Twitter is bound under the Digital Millennium Copyright Act (DMCA) and must do everything [...]