Hello,
We noticed that you're not currently using AdSense for search,
which means you may be missing out on revenue from your pages. We
now offer more customization options for refining your search
results and tailoring them to what your users are looking for, and
we invite you to give AdSense for search a try. As you may know,
you'll be paid for valid clicks on the ads which appear on search
results pages.
Here are some of the new features you might be interested in:
• Site Search: We've heard that many publishers are concerned
about users leaving their sites through Websearch, and so now you
can choose to provide just site search. You can also host the
search results on your own pages so that your users can find the
information they're looking for without leaving your site.
• Improved indexing of your pages: We've recently improved our
indexing technology so that you can provide a more enhanced Site
Search experience for your users. AdSense for search will now
index even more pages of your site, as long as we’re able to crawl
them, so that your users will see more results from your site in
your AdSense for search results.
• Vertical Search: You can also allow your users to search across
multiple sites you select - this could be a network of sites that
you own or other related sites that you think your users might
find useful. If you write book reviews on your blog, for example,
you can use vertical search to specify a list of online bookstores
for users to search through.
• Refining searches with keywords: You can tailor your search
results and ads to the content of your site, since search terms
can have different meanings in different contexts. Let's say you
manage a site about yoga - you can enter keywords such as 'yoga,'
'exercise,' and 'meditation' so that when a user searches for
'mat,' the search results and ads will be more related to yoga
mats and less to commercial floor mats. (You can see an example of
this in our video at
http://www.youtube.com/watch?v=qEwxC9hrxM4 
.)
In our experiments, we've found that this tuning has led to an
increase in earnings for publishers.
• Selecting ad location: Now, you can decide where to place your
ads on search results pages -- whether it's at the top, bottom, or
right side of each page. We recommend placing ads at the top and
right side of the page, as we've found this monetizes the best for
publishers.
To set up AdSense for search on your site, just visit your AdSense
Setup tab and select 'AdSense for search' as your product. When
you create a new search engine, your settings will be saved in
your account -- you can then go back at a later time and quickly
make any updates without regenerating the code.
If you'd like to learn more about the new features available for
AdSense for search, visit
www.google.com/adsense/afs 
.
We hope you'll give these new AdSense for search features a try,
and we look forward to working with you in the future.
Sincerely,
The Google AdSense Team
Google Inc.
1600 Amphitheatre Parkway
Mountain View, CA 94043
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