Whoops! Professional PC John Hodgman makes much of his prodigious nerd skills, but he just mistakenly "Tweeted" his cell phone number to his 82,493 Twitter followers.
Hodgman hit the "Tweet to everyone button" when he meant to hit the "direct message to just this one person" button on a note that included his phone number. He took it down fairly quickly, but not before a handful of folks "re-Tweeted" it, meaning the number will likely be public forever. And of course, you can never really take anything down from Twitter—the search function archives it all: