It is always amusing when one of the big search engines advertisers on one of the other ones. Both Google and Yahoo advertise through each other’s PPC programs. And now it looks like Microsoft has jumped into it as well, by advertising Live.com through Google AdWords, according to Google Blogoscoped.
However, the same search on Yahoo doesn’t show the same Live.com ad, so they are obviously being selective about where they spend their advertising dollars!
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