Coca-Cola, IBM, Microsoft and Google were all amongst a list of large companies successfully using Google AdWords.
While it is clear that search ad marketing, keyword advertising and topic based matches represent a significant percentage of the total online marketing sector, there is difficulty in finding specific information to determine precisely to what extent and how significant this is.
There is enough available information to determine factors such as total revenue, spend, and growth, but there is a lack of information which directly compares the keyword search ad marketing to other types of digital online advertising.
In addition to this, while almost all large tech and big business companies employ the services of keyword advertising, which is clearly visible from online searches, most however do not disclose specifically what their spend is as a percentage of all advertising spend, nor do they publish return on investment figures.
In terms of studies and academic research on the subject of keyword advertising, most available online information provides details either of studies such as the most expensive keywords, or research into how to use keyword marketing successfully. Less information is available about the companies actually using keyword marketing and to what extent they are doing so.
Almost all the available industry statistics and information on keyword advertising relates to Google AdWords. Google currently controls 92% of the search engine market, and therefore all available information that has been found relates specifically to Google AdWords or Google search, with almost no information found on the non-Google search market.
Only the project owner can select the next research path.