Related terms:
cpm
cpc
pay
spam
paid
click
yahoo
cost per
sites
google
keyword
visitor
contextual
auction
click fraud
search
revenue
affiliate
legitimate
cost per click
cost per mille
marketing
cost per action
publisher
search engine
advertising
affiliate marketing
internet marketing
online advertising
search engine optimization
Wikipedia sources:
Pay per click
Affiliate marketing
Online advertising
Click fraud
Search engine marketing
Context for words:
pay
per
click
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