Some of the projects that use MD5 as the default method for storing user passwords include WordPress, osCommerce, SuiteCRM, miniBB, SugarCRM, CMS Made Simple, MantisBT, Phorum, Observium, and X3cms.
A hash is kinda trash. Or, more precisely, not only will hashing data not anonymize it, but regulators, including the Federal Trade Commission, consider hashed identifiers to be personal information.