Google Photos' was only within your account, and didn't assign any of the faces to you unless you manually assigned it as "me". Later they included the option (

Google Photos' was only within your account, and didn't assign any of the faces to you unless you manually assigned it as "me". Later they included the option (via opt-in) to have Google suggest that your friends share with you photos that have you. Facebook's is platform-wide, and you don't have the option of tagging faces but not assigning them to you or to specific people.