This document summarizes a study on the demographics of social media users. It discusses how personality traits like extroversion and openness impact social media use, with extroverts and those open to new experiences being more likely to use social media. It also overviewed different types of specialized social networking sites for different races, ethnic groups, and interests. Major social networks like LinkedIn, Facebook, and Twitter were examined along with their target demographics. The study was conducted through an online survey of 3,000 participants and analyzed 340,000 online friendships and 200,000 interpersonal messages.