what is "cost per aquisition" and what do you believe is the most acceptable way to count the effectiveness of a web site? Impressions or unique visitors? This is a huge problem in Greece right now. Every site has it's own general overview of it's performance and visitor's behavior so things are confused.
Thanks in advance
"Cost per acquistion" may refer to the marketing spending required to bring a new visitor to a site, ot the cost of generating a subscriber, or the cost of making whatever sale a site aime at.
Sites have different goals, missions and standards of success. A site might be designed to sell retail products such as books, vdeos, muic, food, cars, etc. These sites may need repeat customers, who buy music every month or more often. A site selling automobiles will probably not see the saem customer more than once in three years once sale is made.
Other sites generate revenue via advertising, still others from subscriptions, and some by conveying information to support corporate image, with a one-time message. If you are evaluating sites as advertising vehicles, and seeking reach, then unique vistors will be the key.
>"Brand Visibilty Index" is not a standardized media term. It might be a term invented by one agency or advertsing school to indicate a specific concept they use in describing some situation. It might be an index of Brand GRP versus category average GRP. Or it might be something else based on awareness, clutter, etc.
What may seem important to a site, like building impressions so that it has ad inventory to sell, may be relatively meaningless to an advertiser. Sites with a million unique visitors may be able to sell you as many unique visitors as a site with 10 million, because your needs only call for 200,000 unique audience. Evaluate according to your plan's needs, not the site's claims of success.