Separate campaigns based on ad distribution channel. For example, content network campaigns should be initiated with considerably different ads (compared to Google search/search network ads.) Test site-targeted ads within the content network to achieve the best results.
Why? The Google search, search network and content network reach potential customers at different points in the buying cycle. Ad performance and conversion rates vary greatly depending on the network or site an ad appears on. For example, a consumer who is searching for a specific consumer electronics model is nearing the end of the purchase cycle. A consumer who is just starting the purchase cycle is likely to begin their search with a broad term like "home theater".
How to identify ad group performance challenges and opportunities;
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