i don't really blame her though, some of the men on there are creepy as forget and i already get harassed enough by thirsty dudes at school
You do get full control of who can see and/or comment on your profile/activity, plus you can completely block people from seeing your account.
If there are people on facebook who harrass you or creep you out you can remove them (you'd have to friend them in the first place, or be posting all your stuff as public rather than available only to your friends).
And there are report features too.
Facebook is very safe so long as you utilise it's safety features.