PPC Tip: Don't Mix Contextual Ads and Search Engine Advertising
Traffic on the Google content network can also fluctuate from day to day as your ads match new sites. To better control your spend on the content network, make sure that you implement content bids or set up a separate campaign that is targeted just to the content network.While Google's addition of separate bidding for content ads was a welcome change, that's not a very good solution. Since the budget is controlled at the campaign level, it's important to manage search ads in campaigns independent of content ads. Otherwise, a large fluctuation in traffic from the Google content network could, effectively, disable search ads (by spending the entire daily budget). Here's a screenshot of the ad distribution network choices:
Notice that this particular campaign is configured for search ads only. A contextual advertising campaign would only have the "Content network" box checked. For more detailed information about effectively managing a Google AdWords PPC advertising account, read the updated contextual advertising article or my update to a click fraud isolation strategy.
Tags (created by the free TagBuildr tool): google adwords, ppc advertising, search engine marketing, contextual ads, content network, ad distribution, pay per click fraud