The Photographer has the right to post all your photos on social networks.

Copyright law says when you take a photograph, you become the copyright owner if the images created.
This mean you hold the exclusive rights to:
Reproduce the photograph.
Display the image in a public space.
Distribute the photo.
Create derivates of the image.

If the client wants a private photo shoot, they has to pay an extra fee and notify in advance for the copyrights of the session.