No more email?

That's what Facebook COO Sheryl Sandberg is predicting. Of course she's not exactly a disinterested observer - Sandberg says that along with SMS, social networking will be the favored way of communicating. Maybe, maybe not, but The Atlantic's Derek Thompson says that trying to guess the hot new technology in 20 years is not only impossible, it's pointless:

-- Twenty years ago, there was practically zero commercial email.

-- Eighteen years ago, there were practically no mobile phone text messages.

-- Fourteen years ago, there was no AOL Instant Messenger.

-- Twelve years ago, there was no Google.

-- Eight years ago, there were no BlackBerry smart phones.

-- Seven years ago, there was no Facebook.

-- Six years ago, there was no YouTube.

-- Five years ago, there was no Twitter.

-- Four years ago, there was no iPhone.

-- Three years ago, there was no public Gmail.

-- Two years ago, there was no Apple App Store.

-- One year ago, there was no iPad.