I think that you are 100% right, we have a duty to our children and should never share pictures on social media of them.
Now I did share a poem my wee five year old wrote, but that (I think) was different to sharing a picture of him, although you may disagree.
Sharing poem is great, my post is based on reality and dangers we currently face due to social media. I disagree with sharing naked pictures of family members on social media but not poems or some happy moments with personal friends (even though those people can still abuse it without your knowledge). Stories and poems are great.