Everyone updates their own cards, and it focuses on social networks and usernames of the future versus traditional email and telephone.

With that said, it also notifies you when your contacts' email and telephone numbers change... which is great.

I don't want to be notified when my contacts change their telephone number, I just want it to be up to date. And my phone does that already. Also, you don't go into a lot of detail on what a "card" is... I assume it's like a profile on your service? Who updates this?

Uhm... my contact list supports social networks, even integrates with snapchat, twitter, instagram, etc...

Maybe it's apple that is lacking in this notion, but it's something android has been doing for years?

Check out this blog post I wrote: http://benguild.com/2014/05/18/announcing-accounts/ The goal is to turn it into a system of connections without strings attached, and ultimately reduce the reliance on specific or multiple networks for retaining long term contact with people.

Does that seem valuable to you? The big push for consumers is relationship portability between services

What app are you using for this? Or are you talking about the stock Android contacts list?

stock, at least for me; applications can integrate with the contact list and the icon / link shows up in my list.