Best of 2008: Search Engine Marketing
WebMarketCentral
JANUARY 30, 2009
Superpages , Facebook , Quigo (interesting), ContextWeb , LookSmart , ASK (lower CPA than Google? For example, "generates a cost per acquisition (CPA).competitive Of course, any search marketing program should do more than just generate clicks—without some measure of ROI, it's too easy to spend money unproductively.
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