I'm thinking of ghosting my job
Why would you ghost your job?
The work is a complete bore and I hate it. I'm thinking of starting a business instead.
That's fine that you want your own business, but you should at least inform your boss first. They have the right to know.
I wont try to contact them. I'll just block and delete them on social media.
You shouldn't leave a job without at least letting them know. It's possible that you'll need a reference sometime, so you don't want to burn bridges for no reason.