As of September 29th, 2017, the List app closed its doors. It was a super sad day to watch the app go.
This was the message shown to users:
I for one, was an active reader on the app. I love the idea of reading things in lists. I've preserved some of my favorite ones here on this account.
Excited for what the List app team builds next! I believe they will crack even bigger and better problems and build amazing new products!