VIRALITY, RETENTION, AND THEIR INTERRELATEDNESS VIA F-GROWTH

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...Having achieved a positive value of F-Growth, one can mobilize a round of venture investments and advance the product to a major market. In the opposite case, if the project is incapable of increasing its user base, i.e., F-growth < 1, the raised money will be wasted.

K-FACTOR - NOT THIS:-)

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...But neither the author of the blog BassDrive Richard Fong, any Wikipedia article, or even Harry Harrison in his story "The K Factor" do not account for much. 
Blindly borrowing a term from Nucleonica and Epidemiology they believe that it is enough to "infect" the newcomer as the user base to expand...

PARADOXICAL MOTIVATION

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It’s a curious fact, but an attempt to motivate users often leads to a very paradoxical consequences.

In our project i2istudy the “game currency-minutes” can be earned in two ways by acting as a “teacher” and by inviting friends. Wanting to earn extra money...