What a day for Facebook.
The company has announced it is becoming an OpenID relying party, enabling users to log in to Facebook using an OpenID from any provider like MySpace, Google, Yahoo or AOL.
Facebook engineer Luke Shepard made the announcement at a developer event held at the company’s headquarters in Palo Alto on Monday. Earlier the same day, Facebook launched its new Open Streams API, a set of standards-based tools developers can use to incorporate user’s streams into third-party applications.
Shepard says Facebook will auto-detect if a user is logged in to any OpenID account when they arrive at Facebook.com. So, for example, if you’re already logged in to Gmail when you visit Facebook, you’ll be given the option to automatically log in to Facebook with one click. New users will also be able to quickly get started on Facebook by authenticating with OpenID.
This development comes less than three months after Facebook joined the board of [...]

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The Facebook stream is now wide open for developers.
The social networking site has launched its new Facebook Open Stream API, a set of tools developers can use to build apps that let users read, interact with and write to their Facebook stream. The company announced the arrival of the new API, which uses the emerging Activity Streams standard, in a blog post Monday morning.
Update: Also on Monday, the company announced it will soon offer support for OpenID logins.
The Facebook “stream” is the constantly updating river of news that displays what’s going on with you, your friends and whatever tidbits they’re talking about or sharing. Facebook defines the stream as the “the core Facebook product experience.” That’s definitely been the case since last month, when the site changed its default page design to bring the stream front and center.
The Open Stream API gives developers access to that flood of real-time information, and not just to re-publish [...]

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Firediff is a new and useful extension to Firebug that monitors and displays any changes you make to a web page’s HTML and CSS.
The output is color coded and highlights all insertions and deletions to the web page as made through the Firebug interface. The application is not unlike the popular “diff” application found in Unix-based operating systems that allows you to see a side by side comparison of any and all differences between text files.
Firebug is the debugging add-on for Firefox that allows you inspect properties of the web page and make experimental changes on the fly. Firebug has taken on a life of its own, inspiring add-ons to the add-on like Yahoo’s YSlow or Firediff.
Firediff was released Friday and works with Firebug latest 1.4 release. Details and downloads are available at developer Kevin Decker’s blog.
[Hat tip Ajaxian]
See Also:

The Five Best Firebug Extensions
How to Create a Firebug Extension
Firebug Lite: Debugging Tools That Work in [...]

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