Comment by jerryr

The wording is definitely questionable. The savvy user will understand that if contacts are imported into Facebook and maintained there, changes can't be exported or synched back to Google--a valid concern. But the current warning copy doesn't quite capture that and seems to imply, as you've mentioned, that your data is moved.

Google is so engineering-oriented, I can't tell if this was an honest, poor choice of wording or intentionally vague for the purpose of inducing fear. I'm not against the warning if it's in the spirit of educating users about how to keep their data "free", but if this is indeed vendetta as others here are suggesting...well, that's Google's prerogative, but this method would seem a bit unprofessional. If they want to attack Facebook, I'd have more respect if they were explicit about it in this warning.