When you enter the world of blog advertising, the following are some terms you need to know:
Page views: A single page viewed by one person.
Impression: A single ad served to a user’s browser from your blog.
Clickthrough: Both the action of clicking an ad and the raw number of people who click a given advertisement during a given period.
Clickthrough rate (CTR): The number of clickthroughs divided by the number of impressions, multiplied by a hundred and expressed as a percentage. The typical CTR for banner ads according to Google is 0.05 percent; for text ads, it is 3.0 percent.
Conversion rate: The number of people who actually buy a product or service divided by all the times that ad was shown.
Cost-per-1000-impressions (CPM): What an advertiser pays to have a given ad seen by one thousand people, online or off. Numbers vary wildly, but in one comparison
(http:// answers.google.com/answers/threadview?id=445860),
a half-page, black and white newspaper ad cost $23.32 CPM, compared to $0.98 CPM for a four week long online ad.
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