The document discusses building a public persona to help one's career. It notes that having some online presence through platforms like blogs, Twitter, LinkedIn allows people to learn about you before meeting and gives you more credibility in job interviews. The document then shares the author's experience gradually building their profile over years through minimal efforts like blogging, attending meetups, speaking at conferences, and connecting with others online and in person. Maintaining an online presence is presented as a low-effort way to positively impact one's career.