Cost per click advertising (e.g. AdWords, Yahoo! Search Marketing) overcomes this problem by charging advertisers only when the consumer clicks on the advertisement. However, due to increased competition, search keywords have become very expensive. A 2007 Doubleclick Performics Search trends report shows that there were nearly six times as many keywords with a cost per click (CPC) of more than $1 in January 2007 than the prior year. The cost per keyword increased by 33% and the cost per click rose by as much as 55%. 

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Cost per thousand (e.g. CPM Group,, also known as cost per mille (CPM), uses pricing models that charge advertisers for impressions — i.e. the number of times people view an advertisement. Display advertising is commonly sold on a CPM pricing model. The problem with CPM advertising is that advertisers are charged even if the target audience does not click on (or even view) the advertisement.

Cost per acquisition advertising (e.g. TalkLocal, Thumbtack) addresses the risk of CPM and CPC advertising by charging only by the lead. Like CPC, the price per lead can be bid up by demand. Also, like CPC, there are ways in which providers can commit fraud by manufacturing leads or blending one source of lead with another (example: search-driven leads with co-registration leads) to generate higher profits. For such marketers looking to pay only for specific actions/acquisition, there are two options: CPL advertising (or online lead generation) and CPA advertising (also referred to as affiliate marketing). In CPL campaigns, advertisers pay for an interested lead — i.e. the contact information of a person interested in the advertiser's product or service. CPL campaigns are suitable for brand marketers and direct response marketers looking to engage consumers at multiple touchpoints — by building a newsletter list, community site, reward program or member acquisition program. In CPA campaigns, the advertiser typically pays for a completed sale involving a credit card transaction.
"The number of Cyberchondriacs has jumped to 175 million from 154 million last year, possibly as a result of the health care reform debate. Furthermore, frequency of usage has also increased. Fully 32% of all adults who online says they look for health information "often," compared to 22% last year." said Harris Interactive in a study completed and reported in August 2010 with demographics based in the United States of America.[5]
Send releases out over the wires. PR Newswire and Business Wire are well known press release distribution services. Some services charge a fee, and others are free. Look for general distribution platforms like PRWeb and Newsvine, and also industry-specific distributors or “Microlists” that deal with niches such as tech, healthcare, lifestyle, and finance.

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