Group Invitations
Using Jamroom
The invite module allows for an Invitation Type option in the QUOTA CONFIG to allow you to send to followers or email list:
Quote: Select who the user is allowed to invite:
Followers - User can only invite existing followers *
Email Address List - User can import a list of Email Addresses to invite
Both - User can select either option
Or you could, as the admin, use the newsletter system to send to everyone.
If Im understanding correctly:
'ceri' creates a group "dog lovers" then 'michael' wants to send an invite out to everyone in "dog lovers".
No, unless 'michael' is connected to the 'ceri' profile, that can't be done. ( protection against 'ceri' not wanting 'michael' to send out that invite.)