What is the right age for a child to use the internet and social media?

I see many countries promoting social media to raise the age for using it (e.g., Australia, the UK, etc.).

The sad thing is that some parents are already giving their toddlers a tablet to "entertain" them. This hurts the child's brain development. Not to mention when they get on social media and are exposed to various trends.

I got on the internet when I was 10, and I have to say that for the first 7 years, I didn't use it to my advantage (except for editing videos and photos). On the other hand, the faster we learn to use technology, the faster we get the benefits.

What rules would you set for teenagers/kids when it comes to using technology?

(As for me, I would probably want my child to acquire as many offline hobbies and skills as possible at the earliest age, because sitting alone in front of a computer and getting addicted will make that person unable to do anything in the physical world. At least lettargic to try offline things.)