An Internet organization for book lovers, frugalreader.com, offers members two free credits if they send an e-mail that convinces someone else to join the organization by January 1. This is an example of:

Question

Quizplus · Accepted Answer

This is an example of viral marketing, where existing members are incentivized to spread the word and recruit new members to the organization.

An Internet Organization for Book Lovers, Frugalreader