This document summarizes research from the Pew Research Internet Project on how Americans interact with political content on social media. It finds that social networks tend to function as "echo chambers" where people are mainly exposed to opinions they agree with. Many social media users have "trimmed" their networks by unfriending or blocking people with opposing political views. However, the majority of social media users report having a mix of views among their friends and usually ignore political posts they disagree with. The document provides advice on how to effectively engage different types of audiences on social media.