I have used Hectors World:
This is a good introduction for the very young students (Year 1's) about safety online.
I am keen to try the Seesaw app with a view to students sharing some parts of their school day (photos, learning, text) with their families via that app. At the moment my school uses Class Dojo which does allow private messages between home and school so students could use that to communicate with their families via an online platform. I've heard good things about Seesaw though and would like to look further into that.
Hectors World esafety.gov.au
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