Using the Atom Publishing Protocol, also known as AtomPub, you can update profile entries.
Retrieving a profile entry
To retrieve a profile entry document, use the web address found in the entry's edit link in the profile service document. You can only retrieve the profile entry for the user whose credentials you use to authenticate the request. In other words, you can only retrieve your own profile entry document or someone else's if that person provides you with his authentication credentials.
Updating profile entries
To update your profile entry, send an updated profile entry document in Atom format to the existing profile's edit web address.