How to Mass Invite Someone to Your Facebook Groupby Tara Kimball
Facebook groups provide dedicated areas for people with similar interests. You and your friends can all post and contribute to conversations on a group page. When you create a Facebook group, you can invite friends to join the group any time you wish. If you want to avoid creating individual invitations, send an invitation to everyone at one time.
Open your Internet browser and go to your Facebook group page.
Locate the "Members" box at the top of the right-side panel. Click "Add Friends to Group" link.
Start typing your friends' names. Click a name when it appears in the drop-down menu. Repeat this for each friend you want to invite. Separate names with a space.