I'm going a little lazyweb here, but I'm wondering if anyone knows of good recent research on the factors driving the relative popularity of different social networks. I'm looking for data and insights into what drives adoption and defection from one platform to the next (i.e. shift from FB to Instagram, rise and fall of Twitter, etc). Any suggestions? Thanks in advance for your help. Alex -- Alexandra Samuel alex@alexandrasamuel.com @awsamuel on Twitter/Skype/AIM etc cel. 604.726.5445 *Work Smarter with Social Media * now available on Amazon <http://www.amazon.com/gp/product/B00U2RQJCY/ref=as_li_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B00U2RQJCY&linkCode=as2&tag=socisign07-20&linkId=6OIAAO2WGETVFV7B>