only available to employees via an Intranet are called corporate blogs. Companies use internal corporate blogs to enhance the communication, culture and employee engagement in a corporation. Internal corporate blogs can be used to communicate news about company policies or procedures, build employee esprit de corps and improve morale. Companies and other organizations also use external, publicly accessible blogs for marketing, branding, or public relations purposes. Some organizations have a blog authored by their executive; in practice, many of these executive blog posts are penned by a ghostwriter who makes posts in the style of the credited author. Similar blogs for clubs and societies are called club blogs, group blogs, or by similar names; typical use is to inform members and other interested parties of club and member activities. Aggregated blogs Individuals or organization may aggregate selected feeds on a specific topic, product or service and provide a combined view for its readers. This allows readers to concentrate on reading instead of searching for quality on-topic content and managing subscriptions. Many such aggregations called planets from name of Planet (software) that perform such aggregation, hosting sites usually have planet. subdomain in domain name (like http://planet.gnome.org/). By genre Some blogs focus on a particular subject, such as political blogs, journalism blogs, health blogs, travel blogs (also known as travelogs), gardening blogs, house blogs, Book Blogs, fashion blogs, beauty blogs, lifestyle blogs, party blogs, wedding blogs, photography blogs, project blogs, psychology blogs, sociology blogs, education blogs, niche blogs, classical music blogs, quizzing blogs, legal blogs (often referred to as a blawgs), or dreamlogs. How-to/Tutorial blogs are becoming increasing popular. Two common types of genre blogs are art blogs and music blogs. A blog featuring discussions, especially about home and family is not uncommonly called a mom blog. While not a legitimate type of blog, one used for the sole purpose of spamming is known as a splog. By media type A blog comprising videos is called a vlog, one comprising links is called a linklog, a site containing a portfolio of sketches is called a sketchblog or one comprising photos is called a photoblog. Blogs with shorter posts and mixed media types are called tumblelogs. Blogs that are written on typewriters and then scanned are called typecast or typecast blogs. A rare type of blog hosted on the Gopher Protocol is known as a phlog. By device A blog can also be