Interesting chart from Business Insider. Their commentary reads:

In November 2010, Facebook held an event at its headquarters to talk about new mobile products.
After the presentation, a reporter asked Mark Zuckerberg why there was no talk of a Facebook iPad app. At that point, the iPad was only a few months old, but it was already a phenomenon. Facebook hadn’t yet rolled out an app.

“iPad’s not mobile, next question,” said Zuckerberg to laughs from the audience. He followed up saying, “It’s not mobile, it’s a computer, it’s a different thing.”

Apple had successfully marketed the lightweight, portable iPad as a mobile device. So the reporters in the room were incredulous that Zuckerberg didn’t call the iPad a mobile gadget.

Two years later, it’s clear that Zuckerberg was right. The iPad isn’t any more of a mobile gadget than a MacBook Air. The iPad is just a PC.

Up to a point, Lord Copper.