MINYANVILLE ORIGINALThe Nasdaq Composite Index (INDEXNASDAQ:.IXIC) fell 0.47% to 3 164.61 at 3:00 p.m. today as doubts lingered about the eurozone debt crisis.   The tech sector was lagging due in no small part to Apple (NASDAQ:AAPL) which fell 1.63% to $688.79 as investors bemoaned the tech giant’s inability to accommodate the massive demand for the iPhone 5; riots at a Chinese factory where the phones are assembled may also have played a part.   After Barron’s used its cover story this week to question Facebook's (NASDAQ:FB) mobile advertising business the social networking company saw its stock fall 7.48% ...