It even becomes worse if the 'abuser' is a friend or just someone we share a kind of relationship with and we don't want to get them offended.
Well, there are things you could do, depending on the seriousness of the situation, other than just sitting back and allowing the predator take chunks of your self esteem:
There are some things you have to note too.
NOTE: You remain anonymous when you report anything to Facebook. Facebook will just review your report and act without including any information about you, even when they contact the person you are reporting.