Right now, it's primarily through referral and search. It is a well networked industry so figuring out how to get users to refer other users is one key. Also,

Right now, it's primarily through referral and search. It is a well networked industry so figuring out how to get users to refer other users is one key. Also, with most paid channels (which we haven't used very aggressively yet), keep in mind that the cost of user acquisition and be offset by a. conversion into an upgraded account and b. the lifetime value of an upgraded user.