"Matt Mayberry, who works at a California startup called Dopamine Labs, says it's common knowledge in the industry that Instagram exploits this craving by strategically withholding "likes" from certain users. If the photo-sharing app decides you need to use the service more often, it'll show only a fraction of the likes you've received on a given post at first, hoping you'll be disappointed with your haul and check back again in a minute or two."
If that's true, that's pretty genius and downright scary!
Another example of services hiding things that comes to mind is how YouTube and Google Play filter comments so when you're logged in you see your comments, making you think they've been accepted and visible, however if you log out, your comments are no longer visible.
Is it true? Purposefully showing inaccurate information seems unethical to me.