The short answer is no. You cannot batch import members into your social network. You also cannot create a single sign in function that allows folks to participate on the network without actually signing up or in. You can, however, invite people to become members of your Ning Network.
To get started, click on the My Network tab (or Manage, if you’re an administrator), then click “Invitation”. From here, you can import contacts from an email client by clicking on the corresponding email service icon, such as the red envelope for Gmail, or the Windows logo for Windows Live and Hotmail accounts.
You can also import contacts from a CSV file by clicking on the address book icon. You can upload up to 5,000 contacts from your CSV file.
If you do not mark any profile questions as required, your invitees will only need to fill out a few short fields to join!