San Francisco based Eventbrite went prime time earlier this month when they raised $6.5 million from Sequoia Capital, and added partner Roelof Botha to their board of directors. We had a chance to sit down with Botha as well as founders Kevin Hartz and Julia Hartz and talk to them about their business and the fundraising. We were supposed to talk for just ten minutes, but the interview went on for a solid 25 minutes before we were done. Julia and Kevin talked about Eventbrite's growth to ten million registered users based only on word of mouth advertising. The company lets people sell (or give away) tickets to events - something only the big venues could do previously through companies like TicketMaster. The service is free for people who give away tickets, and they charge a small percentage on non-free sales. The free tickets spread the word to new users, who often come back to sell tickets to their own events. This year, Eventbrite will rack up $100 million in gross ticket sales, says the company. The average ticket price, not factoring in the free tickets, is $60.