In commercial messages, zeigarnik effect is usually employed by using incomplete information to create curiosity and thus a feeling of discomfort and tension in reader’s mind. If you want to see an example of zeigarnik effect in commercial message, you can see it in a viral report titled "The 2 Things Porn Sites are Doing to Make Billions Annually, and How You Can Too" that you can download at http://www.webtrafficideas.com/pornviport.exe.

As you can see, "teaser page" of report (the content that shows up first when you open file) gives hints on what is behind success of internet porn industry, i.e., two tactics that have nothing to do with exploiting sexuality or traditional marketing and which are easy to apply to any business. But it doesn't provide complete answer. It only teases you to get you to send email to 3 of your friends and complete answer will only be revealed after you get job done.

Off course, zeigarnik effect is not a Jedi mind trick. Its effectiveness is relative to various factors. For example, if you're using aforementioned viral report to people who are looking for baby items, it might not work, because you're saying it to wrong people. Besides that, to get most out of zeigarnik effect, you still need to combine it with other copywriting techniques.

Cost Per Thousand (CPM) - The amount an advertiser pays for one thousand advertisement impressions, regardless of consumer's subsequent actions.

Delisting - The removal of a listing as a result of inaction or poor performance.

GeoTargetting - An advertisement targeted at a specific geographical region, area or location.

Impressions - The number of times an advertisement is viewed by web surfers.

Keywords - Search terms or phrases that are related to an advertisement or ad copy.

Landing Page - The specific web page that a visitor ultimately reaches after clicking an advertisement. Often, this page is optimized for a specific keyword term or phrase.

Linking Text - The text that is contained within a link.

Pay Per Click (PPC) - Advertising model in which advertisers pay for click-throughs to their website. Ads are served based on keywords or themes.

Rank - How well a particular web page or web site is listed in a search engine or advertising results.

Return On Investment (ROI) - The percentage of profit that results in a marketing or advertising campaign. Naturally, advertisers want amount of money made to exceed money spent.

Understanding above terminology will help marketers navigate pay-per-click advertising model, which has emerged on Internet and become one of leading advertising models in online world.