The more time people spend on Facebook, the more likely they are to learn the political views of others, especially those to whom they are weakly connected and those with whom they disagree. But how is it possible that Facebook users learn others’ political views when most people report they do not post political content? What matters when assessing the influences of social media communication on psychological polarization is the degree to which content is politically informative about the views of the person who posted it, not whether it is about politics per se. Our focus thus shifts from the intention of the content generator to the perspective of the content consumer. When we widen our aperture, we uncover that a substantial proportion of News Feed content offers clues about the political identities of the posters. Moreover, when users recirculate implicitly political stories with a source cue, their friends are more likely to perceive those stories as being about politics. Thus, people likely underestimate the amount of their own political communication because they only report the content they think is explicitly political, not the larger category of information that is politically informative to others. The definition of what counts as “political” should be considered as a spectrum, not a dichotomy.