List of
Advertising networks and
Affiliate networks, which include CPA Networks as well as contextual and keyword targeted advertising services. Basically networks and services that provide the means for webmasters to monetize their websites.
Pay per click
Pay-per-click (PPC) is an internet advertising model used to drive traffic to websites, in which an advertiser pays a publisher (typically a search engine, website owner, or a network of websites) when the ad is clicked. This differs from more t ...
search engines
Search engines, including web search engines, selection-based search engines, metasearch engines, desktop search tools, and web portals and vertical market websites have a search facility for online databases.
By content/topic
Gene ...
should be listed in a different category. The content network version of search engine's PPC services belong in here though.
internet adver...
Advertising agencies
Digital marketing companies
Networks