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From here, you can either search for either "Facebook" or "Twitter", or just look at the most popular applications for this week. You can bet your bottom dollar that they will be on there near the top somewhere.
You may need to create yourself a new BlackBerry ID, which is formed as your email address plus a password. This can all be done from your simulated device screen.
Please read the disclaimer! You can find this and more, including the explanation - as well as the pro's and con's of using spoofed geolocation on the ZDNet iGeneration blog.