The document discusses how social media has enabled crowd behavior to become independent of time and location. It provides examples of how the 2011 Egyptian revolution and 2011 London riots used social media like Facebook and Twitter. It also explains how social media allows people to belong to multiple crowds simultaneously and discusses how viral waves can spread quickly through social media communities. Key social media tools mentioned are Twitter, Facebook, Instagram, and LinkedIn. Instagram is discussed in more detail, outlining its photo and video sharing features and how businesses can use it to showcase products, provide demos, and document events.