user it's different for me, because I'm the parent, but my deal was when my DC got social media, I let them have it underage on the condition that their accounts were also on my phone. So any notifications from Instagram etc automatically appeared on my phone and I could log into all of my DCs social media accounts from my phone in an instant. Knowing that I could see anything and everything meant they had to be conscious of "would my mum approve of this". Alongside this, I told my DC that if there was anything they didn't feel comfortable with, they could use me as the big bad wolf... "my mum is so mean, she doesn't let me...., she checks my phone....". DDs have used this from time to time.
As they have proved themselves more responsible, I have been able to take a step back and I only do the occasional check of my eldest's phone now. And it's mostly dull, tedious stuff. But by letting her have it early, we were able to exert much more control over the social media and "train" our dc In responsible use. Of course, we had to have a few conversations about things that were inappropriate (but never rude or sexual, more the tone didn't come out so well). But as DC could see we were helping them (and they were younger, so without all the teenage hormones) they would listen and have followed our advice. Every now and then DD1 (14) still shows me something her friends have posted that they consider to be irresponsible... and I am surprised that they would do this. Even DD tuts at them.
We also have a rule that all "friends" on SM must be children and must be people she has met in real life. We don't do virtual friends.
I have to say when DD1 first gig instagram, lots of her friends parents told me they wouldn't let their DC have it, but they did - they just used to do it behind their parents back, one even used to log on using other people's phones because her Mum checked the phone. So I think it's important for the DC to get the dialogue going between parent and child, and to get the honesty and trust going. Hence, we've gone down the route of when our children ask for SM, we've more often than not (but not always) said yes, but it's our job to keep you safe on technology / SM and this is how we're going to do it... our rules are all about keeping our DC safe, so they understand this and accept them, and thankfully for us it's worked so far...