Last quarter Internet search and advertising titan Google (NASDAQ:GOOG) took a big hit as its Motorola unit significantly dragged down revenue growth. (See: Google and Motorola: Destroying Larry's Fuzzy Math.) The fourth quarter of 2012 however was another story altogether as Google saw a major acceleration in its core business offsetting the ongoing decline in demand for Motorola devices. Core Google revenues rose an impressive 22% year-over-year an acceleration from the 19% increase seen in the third quarter. Additionally cost-per-click (CPC) decreased by just 6% -- a big improvement from last quarter's 15% drop. In the end Motorola dragged ...