This document provides a cheat sheet of common social media slang terms used on platforms like Twitter, Instagram, and Facebook. It defines 12 popular slang words and hashtags, including FOMO (#1), TL;DR (#2), WCW and MCM (#8-9). The summary explains that the slang is used to concisely summarize information or reference things like posting old photos on throwback days. The cheat sheet is intended to help readers understand trending social media slang.