what are the drawbacks of Facebook marketing?

1. not anymore "IN"
2. Media garbage
3. Poor Participation, Poor Performance.
4. not getting to the intended audience.
5. It's All About The Cash.

       1.Facebook will ask them to sign in or register.

        2.Likes and comments won't be enabled.

       3.The inability to message you (unless they have Facebook messenger enabled separately)

       4.The inability to schedule an appointment