The Society of Genealogists (SoG) is a UK-based educational charity, founded in 1911 to "promote, encourage and foster the study, science and knowledge of genealogy". The Society's Library is the largest specialist genealogical library outside North America. Membership is open to any adult who agrees to abide by the Society's rules and who pays the annual subscription. At the end of 2010, it had 11,014 members.