This tweet looks pretty real, doesn't it?
It's not, though. I faked that tweet using a Web service named "Let Me Tweet That For You." It's pretty simple -- you type in a Twitter username and a message, and it generates a realistic-looking image of a tweet from that person. It even adds fake retweet and favorite counts to lend some more credibility.
The site is a project of OKFocus, a New York-based marketing agency. It's actually about a year old, but has been somehow rediscovered this week and is really taking off on Twitter.