Kickstarter added the feature to follow other members on the site a few days ago which caused a massive amount of email to those with creative friends. I received just over 100 in one day. Some people are screaming ‘spam’ but it is also very valuable to those with projects. For instance, here are the stats for my Travel Book project.
The basic functionality is sending an email out to everyone following someone when they back a project. A personal vote of confidence from a friend with a link, you can see how it is going to lead to a lot more funding.
The ‘friend backing email’ will most likely be my top referrer for the project.