"[New York Times columnist Nick] Kristof, who is very active on social media, talked about how he engages with his large following, and also said that since the implementation of Facebook Subscribe, he’s seen a big change in the value of Facebook. Kristof says he has 1.2 million Twitter followers, but his Facebook subscribers, who are only a fourth of that number, are more engaged."
(Published January 2012.) Nicholas Kristof was interviewed by Pete Cashmore at the World Economic Forum in Davos, Switzerland. The video is 11 min. 4 sec. His Facebook: http://www.facebook.com/kristof