Google (and other search engines) can be instructed to return results via Operators as a means of querying site-specific metrics
Example: site: www.9flights.co.uk - How many pages Google has in it's index
Google's link operator is an inaccurate public measure of the number of sites linking to you
The Yahoo link operator is actually more useful than Google's equivalent for viewing backlinks
Bing has a useful tool for tracking links OUT
List of Search Engine Operators coming soon
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