Although Twitter 'plagiarism' is nothing new, sources are claiming that Twitter has started removing some tweets after complaints from the original tweeter.
Plagiarism is Bad @PlagiarismBad) has reported that at least five separate tweets have been deleted by Twitter following a complaint by Olga Lexell. She wrote to Twitter stating that she considered the joke she was testing on Twitter as her intellectual property.
Sources: The Verge; Endgadget.