At it's annual f8 conference today, Facebook will announce new services and features. At the core is a major change in how people use Facebook to discover, consume and share content.

CEO Mark Zuckerberg begins his keynote speech at 10 a.m. PT (1 p.m. ET). But already some details have leaked out.

AllThingsD reports that Facebook will begin tracking and notifying friends of everything a user reads, watches or listens to via Facebook. That is a huge shift from the current system where a person has to actively choose to "like" something to share it.

The new passive sharing would greatly increase the volume of content links streaming across Facebook, and presumably those read, watch and listen posts would become part of the new real-time "ticker" that Facebook debuted Wednesday along with a new News Feed.

I expect later today we'll get a look at how exactly this will work, and have a better understanding of what it means for news organizations and other content creators. So stay tuned for updates here.

Update 1: Several news publishers, including The Daily, CNN, the Washington Post and the Huffington Post, are expected to introduce "Facebook editions" today, Forbes Jeff Bercovici reports.

Perhaps similar to the WSJ Social app that debuted this week, editions are expected to let readers discover and read news content entirely within the Facebook site.

The Washington Post Social Reader app on Facebook lets you read stories from the Post and its partners.

Update 2: Mark Zuckerberg confirmed on stage that the Washington Post, Yahoo News and The Daily are among the news organizations launching social news apps to run on Facebook.

Earlier: 5 things to know about the new Facebook Subscribe feature