It's ironic that you probably typed that with a desktop or laptop. Irrelevant? Hardly.
Further, I dislike the touch interface of phones. I may connect a mouse to it so I can see if it's more usable. Then I'd need a Bluetooth keyboard too of course. And since my older eyes strain a bit with the tiny screen I'll probably get a SlimPort so I can read the screen on my regular monitor. Wait! My phone is now a PC!!
Similarly after that article was published, I saw the analytics of a large university and could see the amount of mobile use increasing (thought not as dramatically as POF) with tasks as complex as filling out a college application.
In the end, I'm surprised, but yes, people fill out dating profiles, college applications, and even Hacker News comments from mobile devices more and more.
Phones with keyboards are a dying breed, however -- that's more interesting.
Programming/development it my MBP.