My understanding is this
your permission is only for school. This is a personal account, not school, so not covered by permission.
Having said that, if it is a crowd in a public place (eg NOT the school playground) then it may becovered by the fatc that it is in a public place.
At the school where I was a governor, this would be seen as a safeguarding breahc as they have veyr strict rules around SM, and no-on is allowed to post anything about children on personal accounts. They should only be on school accounts.
This is not OK.
if the deputy is one of the safeguarding leads, you have a choice.
- report to the other lead.
2 report the the safeguarding govenor
- report to LA safeguarding officer.
If your do report, and you are not happy with the result, you should report to the enxt layer (eg to governors) and eventually, (or even as a first step) to the police. that may seem heavy handed, but they are interested in these breaches of safeguarding, as they are indicative of a problem in the safeguarding culture at the school.