This document discusses reciprocity and how to utilize it in social media. Reciprocity is defined as exchanging things for mutual benefit, like returning favors. It matters for building relationships through recognition and being recognized. To use it on social media, one should be genuine, learn to listen then act appropriately through gestures like following or commenting that are in line with one's goals. This allows building strong relationships through ongoing give-and-take over time. Examples given are Buffer gaining users through guest blogging and Redbull passing out free drinks.