Fernando here from Basement. This is pretty spot on. The greater level of intimacy leads to far more interaction since you're pretty free to be yourself and post content that is meant for your actual friends to see instead of random people viewing your perfect life. The intuition is naturally that fewer friends would limit usage, but in fact, it's responsible for the high levels of interaction.

As for the revenue – there are certainly cool opportunities to run relevant ads when you have high levels of attention from someone and their close friends (think group experiences, people buying things at the same time that their friends, etc). That said, we don't like what ads have done to current social platforms. They misalign incentives where the more money the product makes, the worse the product tends to get for users. Snapchat was pretty fun until it went from only seeing friends to seeing celebrity gossip and repetitive ads. Because of that, we're planning on doing a subscription model down the road, similar to what WhatsApp tried out before it got acquired (first year free, then a small fee.) Certainly a new model for a social app, but we think it's the best direction for us long-term.