Whether you want to fly the Jamaican flag or the Stars and Stripes, a Facebook application helps you proudly fly your flag. Facebook applications are pieces of code that modify your Facebook profile to provide you with a customizable Facebook experience. You can find a host of Facebook applications -- including several applications specifically to add flags to your profile -- in the Facebook app directory.
Navigate to the Facebook app directory.
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Type "Flag" into the search text box at the top left and then press "Enter."
Click on an app for the type of flag you want to put on your profile. For example, click "Flag of Mohawk Nation."
Click "Go to app" and then click "Accept" to allow the app to access your profile.
Follow the app's instructions for placing the flag on your profile.