More on Baidu's Q4: The company expects Q1 revenue of $666.5M-$688M, in-line with a consensus of $678.5M. Traffic acquisition costs made up 7.9% of revenue, down slightly Q/Q. Baidu's ad customer base rose just 2.3% Q/Q and 12.7% Y/Y to 311K. However, its revenue per customer rose 5.1% Q/Q and 61.8% Y/Y. Operating expense growth, while high, trailed revenue growth. BIDU +3.7% AH. (PR)