Our list, done by the American Hospital Directory, is based on operating income figures that hospitals must report to the federal Medicare program each year.

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Fully integrated into BlackBerry Contacts, when the customer launches the app for the first time, WhatsApp can automatically scan existing phone numbers in the contact directory and extract the ones using WhatsApp, to help customers build out their contacts list and get started right away.

ENGADGET: WhatsApp lands on BlackBerry 10, offers Z10 owners a BBM alternative

For a list of socially conscious tour operators in Malaysia, visit Wild Asia's directory.

BBC: Sustainable travel in Malaysia

Download the WiFi Directory App, which uses an iPhone or iPad's current GPS location to create a list of nearby wi-fi hot spots.

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She advises consulting a good travel doctor for a list of recommended vaccines and medications (the International Society of Travel Medicine has a global directory online).

CNN: Breathe easy: Frequent flyer health tips

To compile the list of top ten internships, Vault sends surveys to the 1, 100 companies and organizations in its directory.

FORBES: The Best Internships for 2012-13