Social sharing is always off for younger learners (below GCSE age), who are minors and should not be on social media. This switch additionally turns it off for all students if you want it stricter. Adults (tutors, admins) are unaffected.
Sponsor-funded, so it costs you nothing and helps you sign sponsors. Learners earn entries by studying (mastery and reviews count most). Run it once a month.
Curate testimonials (Google or Trustpilot wording is fine). Switch on to show them on the home page. Pull live Google/Trustpilot widgets later.
Publish an update (new material, a feature, a draw winner). It goes live instantly as a banner across the site, and you can share it to social.
Your own consented, double opt-in list (parents and learners who confirmed by email). This is the lawful list you can email. Export it for your email tool.