interfacing with Facebook

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[INV]An error occurred with <appname>. Please try again later.

http://forum.developers.facebook.net/viewtopic.php?pid=345030 I started experiencing this same issue about 5-6 days ago, but waited a couple of days before reporting as I hoped it was temporary.
http://softwareas.com/cross-domain-communication-with-iframes An update in the era of HTML5 (May 6, 2011)

Cross-Domain Communication with IFrames

I'm using FB.Connect.createApplication() to programatically create applications, but I need to retrieve the API secret once the application has been created (the method only returns the app ID and the API key). Without the secret, createApplication() is useless. http://forum.developers.facebook.net/viewtopic.php?pid=198723#p198723

FB.Connect.createApplication and API Secret...

Facebook has launched the Create Application API, which is aimed at making it easier for users to integrate Facebook on their websites and widgets.

Facebook Really Wants You to Integrate it Into Your Site

http://www.webpronews.com/facebook-really-wants-you-to-integrate-it-into-your-site-2009-10

Facebook Lets You Easily Integrate into Sites and Widgets with New Create Application API

http://blog.programmableweb.com/2009/10/15/facebook-lets-you-easily-integrate-into-sites-and-widgets-with-new-create-application-api/ Facebook recently released its new Create Application API , a slim convenience API that makes it easy for developers to generate a Facebook API key for widgets.
In this article I’m focusing facebook latest php sdk to integrate facebook features in your site. Some days ago facebook released their new graph api system and updated their core structure.

PHP SDK & Graph API base Facebook Connect Tutorial

http://thinkdiff.net/facebook/php-sdk-graph-api-base-facebook-connect-tutorial/
http://developers.facebook.com/docs/guides/canvas/

Apps on Facebook.com

This guide describes creating a web app directly within the core Facebook experience.
SDKs

http://developers.facebook.com/docs/reference/login/#permissions

Extended Permissions - Développeurs Facebook

Facebook Login makes it easy to connect with users on your app or website . You can use several methods in the JavaScript or mobile SDKs to speed up the registration process and build a functional system in minutes. Permissions

for Websites

http://developers.facebook.com/docs/guides/web/ Facebook Platform enables you to make your web site more social. You can use our Social Plugins , such as the Like Button to drive user engagement with a single line of HTML. Our Login Button and Registration Plugin let you simplify or eliminate your own user registration and sign-in.
Publishing With an App Token If your app publishes on behalf of its users and requires an access token with no expiration time for the purpose of publishing, you should use an App Access Token. Objects Without Titles http://developers.facebook.com/docs/opengraph/

Open Graph protocol