LinkedIn Corp has been working closely with Research In Motion, and the result is a robust social networking tool for active professionals. It took a while, but rather than throwing apps on a wall to see what sticks, RIM now has a secure system for linking business people.

BlackBerry users can now download a free LinkedIn app that integrates LinkedIn's profile information with the BlackBerry's popular functions, such as the email inbox, the calendar, and the contacts section.

The private company, which is in the process of opening an office in Toronto, has about two million users in Canada.  This is almost double what it was just one year ago, making Canada one of the fastest-growing markets among the 200 countries where LinkedIn operates.

Now, with a click a user can discover the professional backgrounds of the people scheduled in the BlackBerry calendar, and new employment information is automatically added as contacts update their LinkedIn profile.

Last December LinkedIn issued a major upgrade to its iPhone app, with the user interface mimicking the large buttons of the iPhone’s home screen, and each button directing the user to a different part of LinkedIn such as status updates, profiles, connections, inbox and so on. 

The LinkedIn app for the iPhone is free at the App Store, and includes a feature called “In Person” that allows LinkedIn iPhone users to swap contact information by simply bumping their phones together.