Under the Admin Tools (the red part of the menu on the left of the screen when you're in your group) you'll see a section for Promotion. The "invite members" lets you send a group invite to people on your friends list. The "invite Moms" lets you send invites via email to people who aren't CM members (they'll have to join cm to join the group still). If it's someone you consider a friend but isn't on your friends list, copy the url of your group's home page and send it in a PM if you really think they're interested. Be aware that doing that in bulk or to complete strangers is considered spamming and can get your acct suspended or your group deleted.
at 6:03 PM on May. 5, 2011