Don't let let your kids get started on snapchat streaks... they are more addictive than drugs to children. 

I didn't realise how much until my daughter got ridiculously demanding on being allowed her phone to complete her streak. 

https://www.businessinsider.com/teens-explain-snapchat-streaks-why-theyre-so-addictive-and-important-to-friendships-2017-4?IR=T