Keyword research in the field of PPC has many tools available for assistance. The importance of building good solid keyword lists in successful search-based PPC campaigns cannot be overemphasized. The five most overlooked free PPC keyword research tools available are: Google Trends, Google Insights for Search, Google Contextual Tool, Microsoft Ad Intelligence and Facebook and LinkedIn. If you want to see more about each of the five tools and how they can be leveraged for keyword research, check the link below.
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5 Overlooked PPC Keyword Research Tools – Search Engine Watch