I have tracked Ian Clarke for several years now and was very excited to have the opportunity to interview him. He founded FreeNet, a p2p network that enables people living in non-free countries (like China, Cuba, etc) to get secure access to the Internet. He has helped the Skype guys with their latest project Joost, co-founded Revver and is now running his own startup called Thoof. Thoof is a generic targeting engine designed to accurately provide predictions about users like Amazon's "customers also bought" page. That in itself is nothing new, but Thoof is designed around providing accurate targeting for very small datasets. Ian's technology can be applied in a many areas online including behavioural targeting and personalization.