>Infants don't understand the concept of privacy

I'm not sure this is limited to infants, though I realize it isn't an apples-to-apples comparison. People don't realize how they're being tracked by the devices they carry around, or the kinds of data they're willingly giving up. And even if it is explained, it doesn't seem to sink in that there is a wide-open window into their lives through which certain entities can easily peer.