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Pressure grows on Apple to open up iMessage
(finance.yahoo.com)
This is a most excellent place for technology news and articles.
No, it's fully possible to have its own account and log in system, but that adds a layer of abstraction that makes it harder to sell to people as a replacement for their inbuilt messaging apps which just require a phone number.
If you give Facebook any benefit of the doubt in relation to privacy concerns, I guess I can only believe Zuckerberg to be correct.