I can not remotely fathom the use of twitter or even facebook. I have accounts with both even wrote a facebook app but posted maybe a dozen things total and haven't touched either in years. It is utterly unimaginable to me to upload photos of myself at random or post random statements. I haven't a clue how this is keeping in touch.

Likewise the notion that one is in continuous contact with others is also totally alien. I own a couple generations of iphones and androids, wrote some apps for them but otherwise leave them in a drawer. They're there right now batteries dead.

I do not know what percentage of people also think this way, twitter seems to have low penetration but facebook enormous. One thing though is that such people are not posting on the web and so would be under represented.