Aaron Beppu writes:
But some bots are driven by somewhat more trolly motives. A prime example is @StealthMountain, which searches for people using the phrase “sneak peak” and replies with “I think you mean ‘sneak peek'”. Effectively, a coder somehwere has used twitter to greatly leverage his ability to be a grammar Nazi. But worse, it appears that the bot exists just to rile people. While most people seem to take this correction in stride, @StealthMountain’s favorites list (which is linked from his bio line) is populated with some of the recipients’ more colorful reactions. You too, dear reader, can laugh at those victims, and their absurd, futile anger towards the machine.
At the most outrightly hostile end of the spectrum, we find the now defunct bot @EnjoyTheFilm, which searched for mentions of particular films or television shows, and replied with plot spoilers. This is a bot designed to actively try to ruin people’s evening, just for the fun of it.
There is more here, including a proposal for a “Feel Better bot,” via Eric Jonas.