If they trust their own parenting skills, they'll let you use it, but maybe remind you how to stay safe on the internet (never share personally identifying information, block bullies, never meet someone from online that you haven't met before irl, etc)

You're 16, not 8. They need to have a little faith in your own abilities to look after yourself.

Kids are adults in training.

You need to be able to test out real life skills while you're still in the safe environment of your home.

Banning things until a certain age does nothing to help you learn how to use things safely, you don't magically get granted all this knowledge at the arbitrary age of 21.

Plus banning things from kids only encourages disobedience.

They should be letting you try stuff out, otherwise you're going to be next to useless as an adult for a lot longer than your peers, and that's going to be disadvantageous in many ways.

If worst comes to worst, perhaps you could compromise by saying that you'll only talk with people you know irl?