What would you build next? Which features or product direction makes the most sense for them? I was surprised to hear how young people were using them: medium.com (tl;dr as a photo consumption service, not a blogging platform).
And with regards to monetization, do you think they're heading down the right path? Personally, I'd pay a monthly fee for power user tools (like Analytics), though the math probably doesn't add up to their valuation.
Any other thoughts about the service? To be honest, I don't have an account (other than the Branch one) and I'm not sure why...