In an acerbic review of Google+, John Naughton explains electric wok syndrome, which is always worth having in the back of your mind:
A spectre is haunting the technology industry. It is called “electric wok syndrome” and it mainly afflicts engineers and those who invest in their fantasies. The condition takes its name from the fact that nobody in his or her right mind would want an electric wok. But because it is possible to make such things, they are manufactured, regardless of whether or not there is a need for them. The syndrome is thus characterised by the mantra: “Technology is the answer; now what was that question again?”
