I'm not sure if I phrased that right, so perhaps my specific case will explain for me. I have buttons for "fave"-ing and marking-as-solved on puzzles in my blog. The users that know the features exist ...
In 1999 Jakob Nielsen stated that "the Back button is the lifeline of the Web user and the second-most used navigation feature (after following hypertext links)". But the web has evolved since then, ...