Ok. So this Question feels kinda basic, but i need some guidance on the way forward.
I have a directory service in mind, a separate domain name for each city, a seperate Facebook social page and media profile, a seperate directory etc.... but for branding purposes i want it to connect through a common brand domain. Ideally this would mean one facebook app, one login acorss the domains.
Can i use one facebook app for multiple pages?
Can i use one login across multiple domains?
Can I have posts from multisite 1, 2 ,3 4 feed( with pictures) back to main domain multisite?