Again, this raises the concerns people have about the info process. It says that it will automatically change the info if it gets changed online....will there be any notification of the change? And what if the person gets rid of the info altogether, will it simply delete the number or will it keep the number?
I'm sure these questions will be answered in time, but it would be nice to know...
You know, I will have Google contacts (from within GMail) as my main adressbook. I alone have full control over that adress-book, and I will put all the information I need for a person in there (phone number, email, maybe adress).
Any other data-source, let's say facebook, is a bonus and gives me only the information people put in their profile! What I want to say is I don't rely on contact information I don't have control of. If someone I have as a friend on facebook decides to remove his mobile phone number, then fine, I won't have it in the Pixi anymore. He probably had his reason to remove it. If he is important to me, then I have his number in my Google contacts anyway.
Try to see it that way

I honestly don't see a problem there, even if numbers or information of any kind will be removed out of people's profile without notice.