Facebook or any other social media site didn't hack any user account for posting an advertisement link on their page, because they are for it and everybody did that.
They only suspend you or ban you, but can't hack your account. Hacking mainly doing by third party.
Your post is a bit confusing as written, Benny Henson.
lilocrane has not returned to the forum since she posted her question over a month ago. She has not answered the question asked of all posters to this site which is: What is the name of your state? If lilocrane is not in the US, she will need to seek help in her area of the world.
In the US, however, there is as I mentioned earlier the Communications Decency Act, Section 230, which provides an immunity from suit to sites like Facebook and other social media sites for what is published on their sites by others.
Here is a link to the CDA, 230:
https://www.law.cornell.edu/uscode/text/47/230
I agree with you that Facebook would not hack, or have a need to hack, their own user accounts.