Third-party information Two current features of Facebook have to do with third parties associ-
ating information with a user's prole. The Wall" allows other users a bulletin board of sorts on a
user's prole page. Other users can leave notes, birthday wishes, and personal messages. The My
Photos" service allows users to upload, store and view photos. Users can append metadata to the
photographs that allows other users to see who is in the photographs, and where in the photograph
they are located. These tags can be cross-linked to user proles, and searched from a search dialog.
The only recourse a user has against an unwelcome Facebook photo posted by someone else, aside
from asking them to remove it, is to manually remove the metadata tag of their name, individually,
from each photograph. Users may disable others' access to their Wall, but not to the Photos feature.
My Privacy" Facebook's privacy features give users a good deal of
exibility in who is allowed to
see their information. By default, all other users at a user's school are allowed to see any information
a user posts to the service. The privacy settings page allows a user to specify who can see them in
searches, who can see their prole, who can see their contact info, and which elds other users can
see. In addition, the privacy settings page allows users to block specic people from seeing their
prole. As per the usage agreement, a user can request Facebook to not share information with
third parties, though the method of specifying this is not located on the privacy settings page.