Of course he was talking about getting to product/market fit more generally, but for networked products, I would take this description and infuse it with network goodness—users are inviting other users, and sharing content from your product across the internet. You search on Twitter, Reddit, and other social media and it’s chock full of your loyal users talking about how good your product is. Engagement goes up as people find more utility from it, and as more users join.
