Why did you shut it down? Was the stream of incorrect tweets too much for it to handle?
These kinds of error-correcting / "grammar nazi" bots are very popular on Reddit. They also seem to get banned from many subreddits, perhaps because many people find the corrections condescending or that they break the flow of conversation. On Twitter it would be different, though, as unlike what happens on Reddit, Twitter threads don't really get to see all the replies listed... so it'd be pretty easy to ignore such bots.