Most know that behavioural profiling is becoming more and more standard practice every day. Just by watching communication between mobile phones, communication between systems, where people connect to on the internet you can glean so much valuable information about a target. Johnny Long wrote a book about similar ways to accomplish profiling by information gathering on targets. Behaviour profiling can be used to find botnets, DDoS attacks, phishing and other malicious activity. It has good uses.
The next level. Google.org has a site that indirectly tracks flu trends by correlating search terms with location where the search was performed and other information. Appears the accuracy level approaches that of the Centers for Disease Control and has a lead of up to two weeks. This is cool stuff.
