Chris Pirillo (http://chris.pirillo.com) recently put some of your questions to AMD, have a look:

Chris Pirillo has just released an eBook full of Twitter tricks and tips for you to make use of. He is selling it for $1.40. The format of the book is what makes it unique, all the tips are in "tweet" style, 140 characters or less.

For more info head over to his post on his blog.