Posting pictures after birth

Anna
Okay I'm currently not pregnant, however my  cousin/ best friend is, and I'm in charge of her baby shower. She asked me to make a sign for her delivery room that tells people not to post a picture of their baby on social media.. Is this crazy to you? Or just me? Do other people do this? Or is she just being pregnant lol 
Also how long did you wait to put up pictures of your child?