What attracted me to the site is the woman was offering her e-book to her readers. She included in her pitch that there was no opt-in required to receive the book, all she asked for in return is a tweet about her book in return as payment.
The role of social media is the new currency where people see the value of a comment and the impact of how many people it will reach.
“Use Pay With a Tweet (http://paywithatweet.com/) to offer a free excerpt (or the whole book!) in exchange for a tweet promoting the book. Instant viralization! Love this!” – Angie Pederson