Today I received an email:
After more than five years of operation, the Readability article bookmarking/read-it-later service will be shutting down after September 30, 2016.
Currently, ShareEverywhere supports the ability to post links to Readability, so we will shortly be issuing a release that removes support.
It feels like every blog these days is about functionality that’s being removed! We hope to have better news soon!