Social Media

I dont want my sons pictures or anything about my birth posted on social media by anyone. If I choose to that so be it. But I just dont want his pictures on the internet. I don't know if this will change after he is here but as of now I dont want anyone posting pictures. How do I tell people this. I have informed my family but im scared my boyfriends sister will blow up Facebook and Instagram of his birth and pics of him. Should I just let her do it. I dont wanna seem like a bitch.