Branch.io deeplink to facebook page
Is it possible to deeplink from an email or a banner directly to a Facebook page in the Facebook app on iOS & Android?
Unfortunately there is not. It is possible to get the Facebook app to open with its URI scheme (fb://) but it does not officially support inbound deep links (you can read more about this in various places online, such as this StackOverflow thread). This means there is no way to specify where the user should be routed once the app launches.
Even if that were not the case, the Branch smart banner requires the Branch SDK to be inside the destination app.
Sorry I don’t have better news for you!