Have you every looked up from their desk and realised that you haven't uttered a word to anyone in over an hour? Maybe longer?
It occurred to me recently when my phone hadn't rung for 3 hours. I'd been communicating with lots of people en masse during this period, mostly by email but also on Twitter and Facebook. But I hadn't actually spoken to anyone; not a peep.
Perhaps this could be a good way to get more kids into learning about history?
Lady Gaga has gone from zero to social media superstar in a little over 18 months. Where has her enormous following come from?

Who are Facebook's most prolific sporting personalities, and why?
Less than an hour after a shock result in ITV's X Factor, public outrage manifested itself in a massive surge of Twitter and Facebook activity

If a social network doesn't carry ad space, will this stop it from making money?
