All for respecting the dead, but I'm more curious in terms of how you can have 5 million users and still need to shut down. Any commentary on whether it's a monetization issue or more along the lines of "5 million isn't worth the VC"?
https://springpad.com/blog/2014/05/springpad-says-goodbye/ "As part of closing our business, a portion of our team is joining Google." So those are the facts. My probably inaccurate opinion is an acqui-hire gone somewhat off the rails.
This begs the question: figure it out later once you have a lot of users or figure it out with a small number of users and then try to get a lot of users?
Obviously not that simple, but curious.