for what it's worth.. Facebook's definition of "us":
1 By "Facebook" we mean the features and services we make available, including through (a) our website at
www.facebook.com and any other Facebook branded or co-branded websites (including sub-domains, international versions, and mobile versions); (b) our Platform; and (c) other media, devices or networks now existing or later developed.
2 By "us," "we" and "our" we mean Facebook, Inc. and/or its affiliates.
(doesn't mention "users" as having those rights..)