On January 15, 2001, with Larry Sanger and others, Wales started Wikipedia. Wikipedia is a free, open content encyclopedia. It grew and became popular very quickly. As Wikipedia became known to the public, he became the project’s promoter and spokesperson. He is often called a co-founder of Wikipedia, though he has argued against the "co-" part. He said he was the only founder. Wales is on the Board of Trustees of the Wikimedia Foundation. In 2004, he co-founded Wikia, a wiki-hosting service which tries to make money. In 2015, Wales started the Jimmy Wales Foundation for freedom of expression, to try to help bloggers or internet activists who are in prison.