[hinata08]

Yes

You can totally share with friends and former coworkers you know.

I've heard of some sharing the company ads with a few acquaintances or PPL who looked for job on LinkedIn to get the bonus if they are hired.

But receiving ads and sharing them to the world is the job of recruitment companies (or websites like indeed). So no need to do it for free.

(Also, that's time consuming, like full time job)