Poke. Okay sure. Let's go there. People are constantly poking their noses into other people's lives on facebook. One of facebook's trademark's is in fact the "poking" feature itself. It's a way to say to someone, "Hey, I'm checking you out! What is it in your life that's going on that makes you seem so happy! And if you're not, what is it that I can bring to the table to make your life more fulfilling?" This is what facebook exists for. For people's necessity in putting themselves out there and seeking feedback from other people that will either make you feel good about yourself, or your realization of the utter power you have in being able to delete someone from your life with a click of the button. (and also finding out that the Great Lake Swimmers are coming soon to a venue near you!)
Mobile devices work in just the same way: it's putting yourself out there so that other people can invest their time into you.