A few years ago I created a Twitter bot to correct people who are confused about when to use “your” and “you’re”. I whipped it up in response to evangotlib having a bit of a meltdown over someone failing to pick the right one for use in an email. In an act of solidarity, I created @youroryoure.
It obviously can’t keep up with every single person who makes the mistake, but it has successfully shamed 152,234 people to date. It consistently confounds the Interwebs in the most entertaining ways. By simply retweeting and adding the text [Wrong!], it leads plenty of people to think the bot is disagreeing with the substance of their tweet. Others get that their grammar is being corrected and become enraged, assailing the sort of flesh and blood person who spend all their free time correcting random strangers. Some people just find it terribly funny that they got caught making a silly mistake.
But the thing that confuses me is the 614 people who follow the account. Why would you want to read that stuff?