A lot of people are saying "it depends" - I totally agree. Some products are built to spread virally, others need to acquire users/customers via advertisement.

A lot of people are saying "it depends" - I totally agree. Some products are built to spread virally, others need to acquire users/customers via advertisement. Eric Ries has some really interesting thoughts on this topic. Check out this blog post: http://www.startuplessonslearned.com/2008/11/what-is-customer-development.html http://www.startuplessonslearned.com/2008/11/what-is-custome...