http://uk.businessinsider.com/the-messaging-app-report-2015-11?r=US&IR=T
http://www.niemanlab.org/2015/11/a-new-tow-center-report-looks-at-the-future-of-chat-apps-for-news/
http://towcenter.org/research/guide-to-chat-apps/
https://techcrunch.com/2015/04/06/the-future-of-messenger/