Within the blogosphere, several sub-communities have developed. These communities are largely divided by genre. Blogs are often identified by a specific genre or topic, such as travel or politics.
- News blogs have become so popular, they have created steep competition for traditional print newspaper and news magazines. The Huffington Post, ranked most powerful blog in the world by The Observer in 2008, has become the go-to for breaking news for people around the world. It is only one of the many news blogs (often attached to printed publications) that have come to dominate current event reporting.
- Political blogs are often tied to a large media or news corporation, such as "The Caucus" (affiliated with The New York Times), "CNN Political Ticker", and the National Review's "The Corner."
- Gossip blogs are also a particular niche that has grown extensively with the development of the blogosphere. This movement can greatly be attributed to the popularity of Perez Hilton, a celebrity and entertainment media gossip blogger. His blog posts tabloid photographs of celebrities, accompanied by captions and comments. Web traffic to the often controversial and raunchy Perez Hilton site skyrocketed in 2005, prompting similar gossip blogs, such as TMZ.com, Jezebel, and the Superficial, to gain popularity.
- Food blogs allow foodies and aspiring chefs alike to share recipes, cooking techniques, and food porn, for others to enjoy. Food blogs such as 101 Cookbooks, Smitten Kitchen, and Simply Recipes serve as a sort of online cookbook for followers, often containing restaurant critiques, product reviews, and step-by-step photography for recipes.
- Fashion blogs also became their own larger than life sub-community following the explosive growth of the blogosphere. Fashion-conscious consumers are offered an insider's view into the fashion industry thanks to blogs like Racked, The Cut, and Fashionista. Besides fashion news blogs, street style blogs have also become exceedingly popular. Bloggers like Scott Schuman (The Sartorialist), Tommy Ton (Jak and Jil), Jane Aldridge (Sea of Shoes), Bryan Grey-Yambao (Bryanboy), and Tavi Gevinson (Style Rookie) are all among a not-so-select group of fashion bloggers who now consider updating their blog a full-time job. These style mavens are able to earn considerable livings through advertising, selling their photos and even providing their services as photographers, stylists, and guest designers.
- Health blogs cover health topics, events and/or related content of the health industry and the general community. A health blog can cover diverse health related concerns such as nutrition and diet, fitness, weight control, diseases, disease management, societal trends affecting health, analysis about health, business of health and health research.
- Scientific blogs cover different scientific and mathematical topics. Some of these are written by leading researchers, others by interested laymen.
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