MarketingSherpa Releases 2008 Search Marketing Benchmark Guide
WebMarketCentral
SEPTEMBER 14, 2007
Online banner ads and print advertising receive the lowest grades for ROI. The return on PR spending is viewed as the most difficult to measure. Click fraud remains a significant problem, but is very difficult to measure (duh! Thinking of bringing SEM and SEO in-house? Like you needed a research study to learn that.).
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