Before, it was the other way around, something that caused privacy concerns because new users might not understand that "public" meant that people outside of their social circle could see their photos and status updates.
More from NBC News:
Arizona Wildfire Grows Tenfold as Thousands Prepare to Flee
Jackie Kennedy's Secret Letters to Irish Priest Withdrawn From Auction
Dem Super PAC Aims to Spend $100M to Target Climate 'Deniers'
"While some people want to post to everyone, others have told us that they are more comfortable sharing with a smaller group, like just their friends," wrote the company. "We recognize that it is much worse for someone to accidentally share with everyone when they actually meant to share just with friends, compared with the reverse."
That should make it easier for Facebook newbies to avoid sharing vacation photos with people they don't know. But even longtime Facebook users can get confused over what exactly they are sharing.
Read More Facebook privacy concerns prompt 'virtual identity suicides'
For them, Facebook is releasing a new "privacy checkup tool" that will take users through who is seeing their posts, what apps they are using, and what private information they might be sharing on their profile.
How to balance features that encourage sharing—like its new "Ask" button and its Shazam-style tool for identifying and sharing TV and music choices—and privacy will almost certainly be on the agenda Thursday as Facebook talks with shareholders about whether they "Like" the direction the company is heading.
—By Keith Wagstaff, NBC News