Social networking sites allow genealogists to collaborate and share information. Sites discussed include Flickr for photo sharing, Delicious for bookmark sharing, blogs for sharing research updates, and Twitter for microblogging. Wikis that allow collaborative editing of genealogical information include WeRelateWiki and Wikitree. Facebook has become popular for genealogists to build family trees and connect with genealogical societies and libraries. Other social networking sites designed specifically for genealogists to build collaborative family trees include Geni, Treex, and GenealogyWise. Traditional genealogy sites like Ancestry and Footnote are also adding social networking features.