I was briefly on Gary Vaynerchuk's site today to look up his twitter id so i could reference it in a tweet and noticed that he has a different approach to the normal name and email address optin box.
He's asking for email address and twitter id (optional).
My first response was "Brillant!"
But knowing how we like to test things, I wonder what the results are with this. Has anyone used anything like this in their optin boxes?