Optimum settings for Facebook Groups
1. Login to Facebook and Goto the group whose settings you want to edit (from the left column on homepage)
2. Click on Edit settings on top right of the group wall
3. for Notify me when select Only posts I am subscribed to
4. Un-Tick the option saying Also send email to
5. For Show this group in home navigation, chose always if thisgroup is important.
6. Un-Tick Send me group chat messages if you don’t want to getgroup chat and it irritates you, otherwise leave it ticked.
If you need detailed explanation of these points see : Things to do as soon as you join Facebook Groups