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Andrew Chen recently led a session on customer acquisition and viral marketing at the First Round Capital CEO Summit. Andrew is a go-to guy on this stuff, deep background and the kind of person I’d like to get into a conversation with about viral harmonics (and get totally schooled).

Zoosk and Are You Interested have been gathering viral marketing best practices for years, along with the social gaming crowd.

Your dating site’s $25 paying customer acquisition costs can be greatly reduced if you do viral marketing right. Problem is, it’s complicated and if your end product doesn’t resonate, you get traffic that bounces like a trampoline.