A blog is a user-generated website where entries are made in journal style and displayed in a reverse chronological order. Blogs provide commentary or news on a particular subject, such as food, politics, or local news; some function as more personal online diaries. A typical blog combines text, images, and links to other blogs, web pages, and other media related to its topic. The ability for readers to leave comments in an interactive format is an important part of most early blogs. Most blogs are primarily textual although some focus on photographs (photoblog), sketchblog, videos (vlog), or audio (podcasting), and are part of a wider network of social media. The term "blog" is a portmanteau, or, in other words, a blend of the words web and log (Web log). "Blog" can also be used as a verb, meaning to maintain or add content to a blog. In November 2006, blog search engine Technorati was tracking more than 57 million blogs. An online diary is a personal diary or journal that is published on the world wide web on a personal website or a diary hosting website. Online diaries began in 1995. As a community formed, these publications came to be almost exclusively known as online journals. Today they are almost exclusively called blogs, though some differentiate by calling them personal blogs. The running updates of online diarists combined with links inspired the term 'web log' which was eventually contracted to form the word blog. In online diaries, people write their day-to-day experiences, social commentary, complaints, poems, prose, illicit thoughts and any content that might be found in a traditional paper diary or journal. They often allow readers to contribute through comments or community posting.