“Growth hacking is acquiring, retaining, and monetizing users more effectively. A growth hacker is an individual who can, from end-to-end, collect data, ideate, plan, execute, and deploy the necessary tactics and strategies to hit goals.” ~Matt Humphrey
On Growth Hacking:
http://www.quora.com/Growth-Hacking
http://www.aginnt.com/growth-hacker
http://www.slideshare.net/mattangriffel/growth-hacking
How to Measure Viral Loops (and, more interestingly, predict how people will travel through time to outcomes):
https://speakerdeck.com/sicross/viral-loops-lessons-from-the-front-line
http://en.wikipedia.org/wiki/Causality_loop
http://en.wikipedia.org/wiki/Predestination_paradoxes_in_fiction
http://en.wikipedia.org/wiki/K-factor_(marketing)
http://www.slideshare.net/anuragmjain/viral-loops
http://en.wikipedia.org/wiki/Metcalfe%27s_law
http://andrewchen.co/2007/07/11/whats-your-viral-loop-understanding-the-engine-of-adoption/
http://www.amazon.com/Viral-Loop-Facebook-Businesses-Themselves/dp/B0040RMF7U
http://en.wikipedia.org/wiki/Viral_marketing
How to Measure Customer Retention (and, more interestingly, grow your seduction abilities):
http://econsultancy.com/us/blog/11051-21-ways-online-retailers-can-improve-customer-retention-rates
http://www.forbes.com/sites/alexlawrence/2012/11/01/five-customer-retention-tips-for-entrepreneurs/
http://www.inc.com/geoffrey-james/customer-retention-keep-good-customers-from-leaving.html
http://en.wikipedia.org/wiki/Customer_retention
How to Measure Engagement:
http://www.businessweek.com/articles/2012-10-12/why-measuring-user-engagement-is-harder-than-you-think
http://www.marketingforecast.com/archives/22347/
http://sociallygold.com/facebook-insights/
http://en.wikipedia.org/wiki/Engagement_(marketing)
How to Measure Expected User LTV:
http://insights.canopylabs.com/?p=81
https://www.custora.com/tour/feature_predictive_customer_lifetime_value_clv_retail
http://www.slideshare.net/BullsEyeInternetMarketing/calculating-life-time-value