 <p>Regarding to FB policies, I do not think you are breaking them. At most, you will need to add it to your privacy policies:</p> <blockquote> <p>3 . You will have a privacy policy that tells users what user data you are going to use and how you will use, display, share, or transfer that data and you will include your privacy policy URL in the Developer Application.</p> <p>4 . A user's friends' data can only be used in the context of the user's experience on your application.</p> <p>(...)</p> <p>7 . You will not use Facebook User IDs for any purpose outside your application (e.g., your infrastructure, code, or services necessary to build and run your application). Facebook User IDs may be used with external services that you use to build and run your application, such as a web infrastructure service or a distributed computing platform, but only if those services are necessary to running your application and the service has a contractual obligation with you to keep Facebook User IDs confidential.</p> </blockquote> <p>But, looking at that library, it seems that they're using the old REST API that is being deprecated, (i.e.., URL <code>https://api.facebook.com/restserver.php?method=fql.query...</code> instead of <code>https://api.facebook.com/method/fql.query?...</code>)</p> <p>I would either (1) contact them to see if they will update the library soon or (2) use another library (such as the <a href="https://github.com/facebook/facebook-android-sdk" rel="nofollow">android-facebook-sdk</a>).</p>