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How on earth did you get the word out to that many people? Virality? Please explain...

More than 50% of our members joined via viral invites -- from emailing friends, twitter posts, facebook posts, etc.

We think it is because of the social tools we weaved into our site + the social nature of design itself.

What top 5 methods of paid acquisition worked best in getting so many members so quickly.

The ONLY effective method of paid acquisition for us thus far has been highly targeted Facebook ads, and they have been extremely effective.

Facebook is far and away the most powerful way to target people socially based on actual interests (likes) vs. just casual searches (goog).