Social networks provide advantages like making new friends and sharing information, but also disadvantages such as privacy issues and cyberbullying. The document describes popular social networks including Instagram for sharing photos and videos; Facebook for connecting with friends and viewing posts; Twitter for sharing short messages; hashtags for grouping topics; Snapchat for sharing ephemeral photos and videos; WhatsApp for messaging; Ask for asking and answering questions; Periscope for live streaming video; and warns to be careful of hackers on social networks.