According to this proposition for a bill of rights, every Social Network and/or Application should guarantee 3 fundamental USER rights
- Ownership of their own personal information: own profile data, the list of people they are connected to and the the activity stream of content they create;
- Control of whether and how such personal information is shared with others; and
- Freedom to grant persistent access to their personal information to trusted external sites.
which in practice means that this services should display the following features:
- Allow their users to syndicate their own profile data, their friends list, and the data that’s shared with them via the service, using a persistent URL or API token and open data formats;
- Allow their users to syndicate their own stream of activity outside the site;
- Allow their users to link from their profile pages to external identifiers in a public way; and
- Allow their users to discover who else they know is also on their site, using the same external identifiers made available for lookup within the service.
As further reading about this interoperability problem between different services and networks, I strongly suggest that you watch both Brad’s Fitzpatrick slides and read his “Thoughts on the Social Graph”: