Google AdWords, Yahoo! Search Marketing and Microsoft adCenter form what’s known as the Tier-One auction-based, PPC networks — with Adwords dominating. Below these are the Tier-Two networks. These are smaller, often niche-based ad networks that combine keyword or contextual advertising on a cost per click (CPC), cost per thousand (CPM), or less often, cost per action (CPA) bidding model.
Depending on your advertising goals, some of these second tier networks may be worth considering. So any serious online marketer should know (1) what are some of the better alternatives out there, (2) what the advantages are to considering any of them, and (3) what to consider/look for once they decide to expand their online marketing reach….




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