When you mute a group, it affects only your view. Muting hides the group from your list of groups and prevents the group's recent activities from appearing in your daily email digest, in the Recent Activities panel, and on the Overview page. Here are some more facts about muting:
Muting hides the group from the Yours and Favorites lists on the Groups page.
Flags assigned on a message in a muted group wall still appear in your daily email digest (for information about the daily email digest, see How do I set up or change my notifications?).
You can continue to post messages to a muted group's wall.
To mute a group:
Open the group, click , then select Mute Group.
To view muted groups:
From the navigation menu on the left, select Groups, then, in the Show menu, select Muted.
To unmute a group:
Open the muted group, click , then select Unmute Group.