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http://andrewchenblog.com/2008/05/14/social-network-marketing-getting-from-zero-to-critical-mass/

Social network marketing: Getting from zero to critical mass | Andrew Chen (@andrewchen)

(above is a picture of fun San Francisco tradition called Critical Mass in which cyclists take over the street! Thank god I don’t drive much around the city) What does it mean to hit critical mass?
http://andrewchenblog.com/2008/11/17/how-to-calculate-cost-per-acquisition-for-startups-relying-on-freemium-subscription-or-virtual-items-biz-models/ Run an ad-supported consumer internet app? You better understand ad-buying too These days, it’s simple to think that advertising is about placing javascript code on a page, and seeing what numbers AdSense gives back to you.

How to calculate cost-per-acquisition for startups relying on freemium, subscription, or virtual items biz models | Andrew Chen (@andrewchen)

Viral and Retention Excel Model (Click to download) See this image before?

Facebook viral marketing: When and why do apps ?jump the shark?? | Andrew Chen (@andrewchen)

http://andrewchenblog.com/2008/03/05/facebook-viral-marketing-when-and-why-do-apps-jump-the-shark/

Lessons Learned – Viral Marketing | For Entrepreneurs

http://www.forentrepreneurs.com/lessons-learnt-viral-marketing/ A short study of this web site reveals that a hugely important factor for success in startup companies is finding ways to acquire customers at a low cost.
I worked with two companies in the past month that needed a way to model viral adoption as part of their effort to understand the impact of a strategic decision to deliver part or all of their technology under an opensource license. Having such model enables them to understand the critical variables and success-factors, set targets for them and then measure as they embark on their strategies. I set out to make a generic model that can at once be used at both companies. http://www.markdevisser.com/2010/02/a-spreadsheet-model-for-viral-growth/

A Spreadsheet Model for Viral Growth — Mark de Visser