facebook groups 'stealing' pictures from others' work

My thread is directed to groups using pictures from other's work , making them look like their own work. I even got emails from FB usersto confirm if the actual work was mine or from another group. As far as your group is concerned, I have no intentions to malign your name or make it sound like a scam. All I tried to clarify was that we are two different groups so that no one confuses one with the other :)