The Old Reader is a feed reading service that allows users to view their content and share notes and comments with friends who get the same content. Currently, users can search for their friends manually or see which of their Facebook and Google contacts are using The Old Reader. Users can import their feeds from other services and share items on their Facebook timelines. The Old Reader will never make any unwanted posts on the user's behalf.
The Old Reader doesn't have an official app, but they do provide a REST API that allows people to write their own apps that include the reader.