What is the market opportunity?: The three social media platforms covered in this book account for over 2.7 billion registered users - a number that may be closer to 3 billion by the books publication. 278 million of Facebooks nearly 1.2 billion users are 55+ years old. 175 million of Twitters nearly 650 million users are over 50. Instagram has the smallest older & wiser base with 48 million of their 800 million users being over 50. Instagram is the platform with the most growth since publication of the previous edition, jumping from 300 million to 800 million users in that time span.Who are we targeting: The For Seniors For Dummies series targets users aged 55 and up on technologies that are ermerging and have interest to this demographic. For this book we assume the user has access to a computer or other device that can access the content and interest in creating an account, connecting with others, and setting privacy/security in a way that helps them avoid the frustrations of using social media.