Users can now hide each status update from specific people as well.However, a user who presses "like" or comments on the photo or status update of a friend cannot prevent that action from appearing in the news feeds of all the user's friends, even non-mutual ones.
Originally if no action was taken, the information was automatically published.
On September 5, 2006, Facebook introduced two new features called "News Feed" and "Mini-Feed".
The first of the new features, News Feed, appears on every Facebook member's home page, displaying recent Facebook activities of the member's friends.
Even if you opt out of Instant Personalization, there's still data leakage if your friends use Instant Personalization websites—their activities can give away information about you, unless you block those applications individually." On December 27, 2012, CBS News reported that Randi Zuckerberg, sister of Facebook founder Mark Zuckerberg, criticized a friend for being "way uncool" in sharing a private Facebook photo of her on Twitter, only to be told that the image had appeared on a friend-of-a-friend's Facebook news feed.
Commenting on this misunderstanding of Facebook's privacy settings, Eva Galperin of the EFF said "Even Randi Zuckerberg can get it wrong.Because the code that was released powers only Facebook user interface, it offers no useful insight into the inner workings of Facebook.