As consultants on Microsoft technology, we are keeping up with what is coming and what is going.
Microsoft just announced:
Microsoft is justifying the removal because “our telemetry indicates limited use of the connector to Facebook“.
My guess or hope is that it may be in preparation of leveraging their LinkedIn platform and making it co-exist better with Office 365? Currently, there is no simple feed between LinkedIn posts and SharePoint without involving coding, I would not be surprised if this is coming in the next months.