I Have seen alot of sample where the API key is hard coded into, unless you are building a desktop there is no need to do this. Facebook provides the API key, and the session key in the iframe url. Your application should retrieve the keys from the url, this makre your code more portable.

Url Variables:

  • fb_sig_api_key
  • fb_sig_session_key
  • fb_sig_ss

UPDATE – 9/10/10

With the new changes to face book app, make sure that you go into the advanced setting and check canvas session parameters.

    In my experience i have found that using the JavaScript client library for Facebook and the External Interface API in flash is alot more responsive than the Adobe Facebook AS3 library. Sometimes the event fails to fire. The only time you should use the adobe library is when you need to upload fotos, and do so by sharing the session data used by the JavaScript client.

    Example of sharing a session:

    fb= new Facebook();
    var session:WebSession;
    session=new  WebSession(Application.application.parameters.fbsigapikey,
    Application.application.parameters.fbsigss,
    Application.application.parameters.fbsigsessionkey);
    session.addEventListener(FacebookEvent.CONNECT, function():void{
    var bytes:ByteArray = jpegencoder.encode(lastpumpyourselfbm.bitmapData);
    var call:UploadPhoto = new UploadPhoto(bytes);
    
    fb.post(call);
    
     });
    fb.startSession(session);
    session.verifySession();
    

    Designed ByCharlie Guerrero
    Developed By: Myself and  co-developed with Aaron L’Heureux
    Technology: PHP, Flash,  jquery, Word Press, MySQL, Flickr, and YouTube
    Website: http://www.a-g.com

    Note: We were tasked with creating a site that would pull in content from a&g blog, Flickr, and YouTube allowing seamless cross linking between the different sections and do it all 4 weeks. This meant writing a middle layer communications api that would query the wordpress database(standard feed from wordpress were not sufficient), Flickr and YouTube  that would return simple formatted XML to be used by Flash. Content Association was done by using common naming scheme for tags accross all frameworks. This design choice gave us a decentralized way of managing content.

    Allen & Gerritsen

    Allen & Gerritsen

    As you view the video below remember that videos are streamed from YouTube and Images are streamed from Flickr