As long as a kid has spoken to the school to give affirmation that they will be heading there & to the other schools to "thank them for the opportunity but we are going another direction" I am ok with the kids posting on social media.
When the post comes out 1st I have an issue with it.
You don't know how many times I've called a parent or coach to congratulate them on a kid and they say how do you know, decision was just made 3 minutes ago!
I usually tell them its my "job" to know. Reality is I just follow the social media.
Rich