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An article directory is a website with collections of articles written about different subjects. Sometimes article directories are referred to as content farms, which are websites created to produce mass content, where some are based on churnalism. An article directory may accept new articles from any contributor, but may require that a new article is unique (not published elsewhere) and not spun (see article spinning). A typical article is around 400-500 words, and tools such as a WYSIWYG editor for writing and submitting an article may be provided. An author box may be provided for personal information about an author, including a link to the author's website. Tags or categories may be used to organize articles and to help with search engines since tags or categories act as keywords that identify the topics covered in the article. Many directories pay the author for his/her participation. Some directories review articles before they are published and there may be a waiting period of several days before a new article appears. This helps to eliminate low quality submissions, including duplicate articles, spam and spun articles. == Submitting articles for SEO == Article directories allow users to submit unique articles to the directory for content syndication. These directories allow articles to embed links to other websites with relevant anchor text. Popular article directories are considered authority sites and are constantly crawled by search engine bots. Webmasters submit articles with relevant anchor text linking back to their site to obtain backlinks. Beginning with the Google Penguin release on April 24, 2012, Google began to punish sites that obtained links from article directories. On January 29, 2014, Matt Cutts, head of Google's webspam team, posted a video specifically warning against the use of article directories for SEO linkbuilding.〔https://www.youtube.com/watch?v=Bo75Og4M34Q〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Article directory」の詳細全文を読む スポンサード リンク
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