Analyze your logs that ask where customers heard about you, leverage trackinglinks to find out how people got to your site, and be sure to stitch site visits together with purchase history to ensure you are focusing on the customers who really matter.
Built on the NationBuilder platform, a startup that has been catering to smaller organizations looking for less expensive "campaign in a box" tools, NewtHampshire has every bell and whistle you could ask for: user profiles, badges to reward volunteer activity, trackinglinks so users can monitor their own progress recruiting others, event hosting tools and a public leaderboard to spur activity.
Griffith's WikiScanner links publicly available data tracking the IP addresses of Wikipedia's anonymous editors with a registry of companies' IP addresses, allowing users to search for all the Wikipedia changes made from any company.