For those interested in this. Luke Wroblewski wrote on a similar theme "Gradual Engagement Boosts Twitter Sign-Ups by 29%" - http://www.lukew.com/ff/entry.asp?1

For those interested in this. Luke Wroblewski wrote on a similar theme "Gradual Engagement Boosts Twitter Sign-Ups by 29%" - http://www.lukew.com/ff/entry.asp?1128 http://www.lukew.com/ff/entry.asp?1128