While Google appears to be the search engine of choice among many sourcers and recruiters, Yahoo has a very interesting and useful search functionality that Google doesn't - linkdomain.

Yahoo's linkdomain search command allows you to search for and find websites/pages that link back to a specified site.

Why is this useful?

Well, it's useful because you can search for websites/pages that link back to specific websites such as Facebook, Twitter, and such - targeting groups and pages.

For example, let's say you wanted to search the web for results that mention CPA, accounting, association or organization, and that link back to Facebook:

linkdomain:facebook.com (association OR organization) CPA accounting

Clicking on the first result will take you to a page for the Maryland Association of CPA's:

On that page, you will find where the link back to Facebook is:

Following that link will bring you to the Facebook fan page of the Maryland Association of CPA's:

And now you've found a group of CPA's in Maryland:

Of course, Yahoo's linkdomain works for any site. Let's look for sites/pages that mention PHP, development, and link back to Twitter.com:

linkdomain:twitter.com php development

That search will take you to these results:

Clicking on one of the first page results, you can find this PHP developer, who asks you to follow him on Twitter if you are interested in his work/projects:

Let your imagination and creativity run wild - using Yahoo's linkdomain search functionality you can target and uncover candidates, groups, associations, and organizations on the Internet, Facebook, Twitter, LinkedIn, or any site.