The Circle feature can be used to save various shared links and notes if you want to read them later.
1. Go to Circles, create a new Circle, name it whatever you want.
2. Do not add anyone in it (Google calls it an Empty Circle).
3. Whatever you want to read later, share it on your Google+ status with only this empty Circle that you have created.
It works as your online repository for bookmarks, videos and any other thing you want to access later.