Founders/makers, how did you discover your first 100 early believers?

For Letterflix.com, we (me and @ansarimofid) found the early 100 believer over a period of one year through organic traffic (by optimising the SEO). Out of our first 100 users, the very first 10 were from friends and friends of friends. Now, recreating the organic traffic lead growth for Blinkstore.in.