Wikipedia
WikiTree is a free, shared social networking genealogy website that allows users individually to research and contribute to their own personal family trees, while building and collaborating on a singular worldwide family tree within the same system. The site was created in 2008 by Chris Whitten, developer of the WikiAnswers website, and is owned and hosted by Interesting.com, Inc. The site uses a “wiki markup" language (powered by MediaWiki software) that offers both beginning and advanced users the ability to create and edit personal profiles, categories and “free space” pages to document their family’s history. As of July 22, 2016, the WikiTree website has over 347,000 registered members and maintains over 11.8 million ancestral profiles.