Ohanian publishes an Ebook which includes his thoughts on the growth of Reddit and Hipmunk:
And this marvelous community of communities owes its existence to a massive advertising budget of…$500. To date that is the sum total of money that has been spent advertising reddit. Five hundred dollars, and every dollar of it spent on stickers. Yes, stickers: the soundest investment I ever made. I used to travel around the country a lot (thank you, Chinatown bus), and everywhere I went I took stickers with me. I put them on signs, poles, and even other advertisements.