There was something innocent and pure about Twitter's total lack of income. But don't worry, the microblogging startup's first advertisements are sufficiently adorable.

Twitter has taken to selling off the "concepts" it defines under user profiles. Early clients include such diverse customers as a website about Twitter and a website about Twitter:

If the ads are a bit twee, well, Twitter's take probably is, too. But the company is determined its ads must be innovative, and revolution is never free.

(Pic: Nathan Macan)