How well do you know your webcam?

Since it first appeared on sale in the 1990’s, the humble webcam has gradually found its way onto every desk and the lid of every laptop. Originally confined to university networks, these devices have become part of our daily lives and play an important part in shaping the Web. They have created new markets, software applications and business models (sometimes involving real human models).
But how much do you really know about webcams? Their history? Their dark secrets?