Is there any way to make a Facebook group viewable only to those you invite?

If you're an admin of the group, then go to the group page. On the right you should see a bunch of options. "edit group, edit members", etc. Click on edit group. Then you should see, "group info, customize, officers...", etc. Click on "customize". Scroll down a bit and you can make a Facebook group viewable only to those you invite and many other things.
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