Parents make that determination. My sister won’t allow her kids to have a Facebook account until they are 18. I have allowed my children to have one when they want it. I get the password and see what is going on....plus I am a friend as well. Any nonsense and I will ban them. So far they are being very responsible.
Heck, facebook is a “right” anymore. I stay way from it.
My wife does all of the above. Plus the computers are in the family room for all to see.
I would bet that the ones who voted that it’s distracting probably don’t even have an account. I think phones and texting is distracting.
My grandchildren have a facebook account, and nearly all their friends have one. In all the cases, every parent is a friend, and can see everything that is posted. Most of the kids are in sports, and it’s a quick and easy way to share team pictures of events, as well as staying up on what friends and relatives are doing. FB also has an ‘unfriend’ tab.