In the early 80's, ROT13 was supposedly used on Usenet newsgroup servers This in an effort to hide potentially offensive jokes, or to obscure an answer to a puzzle or other spoiler, or to fool less sophisticated spam bots[dubious – discuss]. ROT13 has been the subject of many jokes.
In the eARly 80's, rot13 was suPpoSedly usEd On usenet newsgroUp servErS This In an EFfORt tO HIde pOtEntiallY oFfEnsivE joKeS, OR to ObscUre aN answer To a puzZle OR other spOileR, oR to FOoL less sOPHiSticAted spAm bOts[DUbioUs – disCusS]. rot13 HaS bEen ThE sUbjECt oF ManY JoKES.