These days it's become easier than ever to customize social media feeds to include only information you think is relevant to your interests. But is that necessarily a positive development? This book uncovers the problematic aspects of online customization, including the dangers of echo chambers and filter bubbles and the loss of privacy that can result from companies sharing your personal information. Easy-to-read text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards.