Without much surprise there has been significant movement within some of the social networks over the course of the last year. Brian Chappell from Ignite Social Media has put together a comprehensive report based on data from all major social networks existing on the web.
Great wideranging riff on analytics and nonprofit evaluation of methods: how do we know that blogging is good for our oragnization? -> how do we increase our traffic?
K. McKelvey, und F. Menczer. Proc. First Intl. Web Observatory Workshop (WOW), Companion Publication of the WWW 2013 Conference, Seite 1351--1357. (2013)http://wow.oerc.ox.ac.uk/ http://cnets.indiana.edu/wp-content/uploads/truthy-wow.pdf.