Both Google Insight and Yahoo Clue is for SEO purpose.
Google Insight is a search database that can filter on search terms like location, time, and category and give you a graphical representation such as interest over time of search volume, top search terms, and related. It is a product similar to Google Trends that will enable you to examine a certain niche in detail.
It will help you decide which advertising method works best or find out when people are searching seasonal items — the site gives ski resorts as an example.
It can also tell you how competing brands or locations are doing and what markets may be developing for your product or service.
Example:
Yahoo! Clues is a new beta service that gives you a unique “behind the scenes” look into popular trends across the millions of people who use Yahoo! to search each day.
With Yahoo! Clues, you can discover and compare trending information for search terms of interest to you, or explore popular trending search terms on Yahoo!
You can see search volume charts, demographic graphs, maps, or even related searches specific to a demographic group. We’re also experimenting with an interesting feature called “Search Flow,” which offers a unique look at people’s search patterns and the next most probable search term people try after searching for a query.
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