บทที่ 2chaoey2012The document discusses the history and types of blogs and social media. It explains that blogs evolved from weblogs in the late 1990s and became popular in the early 2000s. The document outlines different types of social media including social networks, media sharing sites, social news/bookmarking, and online forums. It also describes various categories and platforms of blogs such as personal blogs, news blogs, collaborative blogs, and different blog hosting websites.
