iMessage and FaceTime are both offline for "some users", according to Apple's iCloud System Status page.
The outage began just after noon Pacific time today, and the company has not given any indication of when service will be restored. Affected users will see iMessages fail to send and FaceTime calls fail to connect.
Top Rated Comments
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The video and audio quality, and connection handling is better than Skype.
WAY better than Skype
I imagine more and more people are using FaceTime all the time. It's pretty sweet.
Apple doesn't have a single centralized data center. It isn't uncommon for parts of Apple's datacenters to be working perfectly and not others, thus affecting only certain areas.