In-laws and social media

My in-laws are very into social media (FB, Instagram, Snapchat, etc. and posting a lot). My husband and I are not into it that much (just GR for him and GR, Pinterest and this app for me and nothing personally identifiable). They have a tendency to post a lot of family pictures and info and in the past, that has included of/about my husband and myself, without our permission. Not just without our consent but when we have expressly requested that they NOT do that and that they remove pictures of just the two of us. Bc of the lack of respect that’s been shown in the past, I’m worried about pics/info regarding my pregnancy and our baby. I don’t want to start WWIII but I do want to make clear in a respectful way that we have an embargo on social media and our child. Any ideas how to best do that?