I read an interesting article about how a group of teen girls stopped talking to their friend because she didn't have an iPhone, so she never got the group iMessages.
Now with facetime audio, there's even more incentive to keep your family with Apple. Free international calls? Sounds pretty sweet. My brother and I tested FaceTime audio out tonight and it was incredibly clear.
On a related to the topic note, a few years ago a bunch of my female friends were using Blackberries and said they couldn't give it up due to blackberry messenger. I always thought they should've released bbm as an iPhone app back in the day, but they never did. Now there is a plethora of messaging services and BB tried to unsuccessfully launch BBM last week. Too little, too late. BB, like Rome, thought they would never fall.