If you put something like that out anonymously, realistically you lose control over when it becomes public that you're behind it.
I created a twitterbot network, delivering generative text to twitter users, for my master's thesis. Have you heard of it?
Given that a sizeable number of twitter accounts are bots[1] and a large portion of tweets are 'pointless babble'[2], without the help of the braindead marketing executive who pushed this into the news, no one would have discovered the owner of the account until Tay was 'swatting' people's houses and selling bootleg Nike sneakers on the Silk Road.
[1] -http://www.techtimes.com/articles/12840/20140812/twitter-ack...
[2] - http://pearanalytics.com/blog/2009/twitter-study-reveals-int...