A Facebook post questioning AT&T’s restrictions on FaceTime over Cellular has gone viral, racking up more than 690,000 “likes” and more than 51,000 comments as of this writing. In a Facebook post directed at AT&T, a customer named Wynter Farmer notes her disappointment with AT&T forcing customers to switch to a more expensive, limited data plan in order to use FaceTime over Cellular on the iPhone 5. “In order for…