Hootsuite is a social media management system that allows users to manage multiple social media profiles from one centralized dashboard. It enables scheduling posts across different networks like Facebook, Twitter, Instagram and LinkedIn. The summary provides step-by-step instructions on how to set up a Hootsuite account, add social networks, organize content into tabs and streams, publish posts, install third-party apps, and use the mobile app to manage social media on the go. Hootsuite offers free and paid business plans depending on the number of user accounts and features needed.