1. SOCIAL NETWORKS With nearly 3 billion users (as of 2021), Facebook is the king of social networking sites. If Facebook were a country, it would have the largest population in the world. Other popular social networking sites are LinkedIn, which targets job hunters and working professionals, Tumblr, WhatsApp, and SnapChat. 2. BOOKMARKING SITES Bookmarking sites, also called social bookmarking, allow users to tag, save, and share links to information of interest with others. Popular bookmarking sites are StumbleUpon, Pocket, Reddit, and Pinterest. 3. SOCIAL NEWS SITES Social news sites feature user-posted stories. Content on a social news site is voted on and ranked by site users or administrators. Social news site users are encouraged to comment on what they read. Comments are often ranked in terms of popularity. Digg is the most popular social news website. 4. MEDIA SHARING SITES Media sharing are sites that enable users to post, store, and share self-created multimedia content such as photos, videos, or music. Popular media sharing sites include YouTube, Instagram, Vimeo, and SnapChat. 5. MICROBLOGGING Microblogs are concise social media posts that are meant to stimulate interaction between the microblog poster and their followers. Microblog postings can include text, links, images, or video content. The best-known microblogging platforms are Twitter and Tumblr. 6. FORUMS Social media forums have their roots in internet message boards, an early type of online engagement. Forums are typically organized around specific topics. A user can post a question or propose a topic to begin a virtual conversation about the topic. Quora and Reddit are two popular forums. 7. SOCIAL REVIEW SITES A review site features user- generated reviews of businesses, products, or people. Popular social review sites include Angi, Glassdoor, TripAdvisor, and Yelp..