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The news is sure to be welcomed by Facebook's 120 million users and its potential partners, but it presents a new challenge to proponents of the so-called "open stack" for ID management -- OpenID, OAuth and the related technologies that allow users to share data across multiple websites.

It's also good for everyone's business. By being able to use a Facebook ID to log in to Digg, the user's barrier of entry is lowered significantly and Digg gets more traffic

But where Facebook Connect is heading towards mass adoption on mainstream sites like Digg, OpenID is currently bogged down by several issues, the largest of which is poor usability.

Zuckerberg argues that Facebook provides something the larger web doesn’t — an undo button — which he feels is more important than data portability.

The example he offers is the Facebook news feed. As it stands if you publish something to your news feed and then decide that you want to limit who can see it by changing the privacy settings, that information is removed from your friend’s updates (assuming they no longer have the privileges necessary to access it). However, were the Facebook news feed offered as an RSS feed available outside Facebook (as we’ve often argued it should be), it would, because of the nature of RSS, no longer be retractable. Even if you changed the privacy settings and removed it from the feed, many RSS readers would already have cached or otherwise stored the post you’d like to retract.