ShareThis is an interesting concept. Do you also offer this functionality to manage mailing lists across multiple connected networks that have significant membership overlap? This would be the B2B version of your product.
I am intrigued by Adknowledge.com and that word behavioral analytics. I am looking for better solutions than Google and Yahoo advertising since do not seem very good at connecting our ads with the right folks. We did a 9 month study were we alternated advertising with Google and Yahoo with not advertising and we did not see any significant web traffic increases. So I would love to talk to you about Adknowledge technology and how this could improve advertising on topics that do not have a popular profile.