On Wednesday, a thread on the front-page of Hacker News was discussing the lack of quality brands on Amazon - the exact problem we're trying to solve. Seeing an opportunity to show Indieshops to new users, we replied in the thread: https://news.ycombinator.com/item?id=20997107.
The idea of Indieshops seemed to resonate with a lot of people, driving ~250 new users to the site, and gathering lots of upvotes. We were especially pleased to see some engaging replies, including the founder of Polyvore ("Bookmarked!").
We didn't expect very much from the comment and wrote it as an afterthought, but it turns out it was our biggest day of user engagement so far! You never know which opportunity will produce results.