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Posting an update to Instagram doesn't have to mean sharing your life with every single person you've befriended there. In fact, all of the major social apps give you more granular control than you might realize. If you want to set up a private, select group of people to show off photos of your baby to\u2014or to keep your most raucous nights out a secret from\u2014you can do so without resorting to emails or group chats.