The FA encourages the appropriate use of social media to help run your teams and leagues, communicate with players (via their parents/carers when under-16), and appoint referees, log results and much more.
Whatever way we communicate with children the safeguarding principles remain the same. Retaining boundaries is just as important online as it is offline.
If you have a role in football then always make sure communications to children are relevant to your role – focus on the football, don’t share personal info or comments.