Whether or not you agree that social media is a danger, it is for the parents to decide if a) their child may be photographed, and b) who gets the photos.
Imagine, 30 years ago, if you sent your MIL a print of your child's school photo. As one did. Then you find that she has had that photo copied, and sent it to all her close family, and a bunch of relatives you hardly know and don't much like. Would you be happy?
It's the same principle. You may want to share pictures of your grandchild with your friends and relatives, but they may not be your DIL's friends, and she may not know or care for the relatives. It's not for you to decide whether Cousin Fred or Auntie Marge gets photos or not. That's for the parents to decide.
Have a respectful conversation with your DIL, and find out whether there are any "safe" people on her permanent approval list. Maybe you are always allowed to send the photos to Auntie Marge, but never to Cousin Fred. Maybe your friend Sue can have certain kinds of photos but not others. I'm sure there are reasons behind the rules. If your DS and DIL don't have a relationship with Cousin Fred, he doesn't need to see photos of their child, regardless of the relationship you have with him. It is not your relationships that dictate the rules, but theirs.
Have any of you got all electric cars? Pros and cons please.