> Import the information from FB, G+
I expect that would be against TOS and would result in an immediate ban.
I expect that would be against TOS and would result in an immediate ban.
When I checked their platform policies (admittedly several years ago), they explicitly forbid other social networks from using FB-provided logins and data. This seems to have changed, and at the moment I can't find anything of the sort in their current platform policies; but there is a "no reimplementation" clause that is so broad, it could easily be used to ban apps that reimplement anything FB already offers (friending, image sharing etc etc).