Twitter has begun to honour takedown requests from users complaining their jokes have been lifted wholesale and shared by others, passing them off as their own. One freelance writer:
I simply explained to Twitter that as a freelance writer I make my living writing jokes (and I use some of my tweets to test out jokes in my other writing). I then explained that as such, the jokes are my intellectual property, and that the users in question did not have my permission to repost them without giving me credit.
Twitter will respond to reports of alleged copyright infringement, such as allegations concerning the unauthorized use of a copyrighted image as a profile photo, header photo, or background, allegations concerning the unauthorized use of a copyrighted video or image uploaded through our media hosting services, or Tweets containing links to allegedly infringing materials.