How can you stop people from adding you to Facebook Groups automatically?The answer is, you cannot.
The only option you have is to leave the group and contact the friend to let them know that you do not want to be part of the group.
If you get re-added, your only option is to leave again and / or remove the friend who has added you from the friend list.
Here is how you leave groups.
Click on Groups on your Facebook profile page.
The groups link is located near the top right corner of the page.
There you see a list of all groups that you are a member of. To leave a group, hover your mouse cursor over the group. A blue x is displayed next to the group. Click on the x to leave the group.
You will get a remove group membership confirmation prompt. Select Remove if you are sure and want to leave the selected group on Facebook.
