Note to Kat Von D: If you tweet and you're famous, someone's going to notice. So when the LA Ink star tweeted an affirmation that she and Jesse James were dating but then deleted it -- it didn't mean that what she wrote was just going to go away. Know that it will be retweeted thousands of times over. But if you're still confused, Kat, we advise a quick social networking workshop so that those Twitter faux pas never happen again. Now that you've admitted you're "in love" with the Monster Garage star, scrutiny will be even that much more intense.