Here is my presentation on Glocal 2.0 conference which is overview of some of the recent tries to define blog and social media influence metrics.
I am very glad that the Robin Hamman from BBC has the post about my presentation. He has one of the several most influential blogs about journalism in UK.
I can only add to Robin’s review that the most important factors of social media influence measurement (processes) and metrics (attributes) are who are the visitors of some blog (are they influential related to given content).