Is social networking killing e-mail?

It's an interesting question, and one that's being raised by Gartner which is predicting that the number of wireless e-mail users will reach an incredible one billion, worldwide, by the end of 2014. A number that's not too hard to accept, given that earlier this year global business wireless e-mail accounts were being estimated in the region of 80 million, and that's equivalent to around 60 million individual users.