An article by Elizabeth Osmeloski published yesterday on Searchenginewatch.com, clearly helps understanding the current agencies' attitude towards search engine advertising. "The most difficult issue facing SEOs and Ad Agencies is determining a method for reporting meaningful data without discrepancies. With pay-per-click, numbers are fairly straightforward and absolute when ROI tracking is directly applied. Yet the industry is still in infant stages when it comes to measuring the branding effectiveness of contextual and keyword advertising."
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