They'll be able to post while inside Events and Groups, or get the option to share there on the Facebook Stories share sheet.
To make sure the new version of Stories reaches as many potential users as possible, it will be available to Groups, Events and Pages.
Facebook also announced today that it's replacing its Messenger Day feature with Facebook Stories, allowing for cross posts between Messenger and the normal Facebook application. The company has removed the redundant direct message feature from Facebook Story as well. In fact, Instagram is already testing a feature that lets users cross-post their Instagram Stories to Facebook Stories - and with Facebook Stories now syncing with Messenger, your day can now be shared across all of your social networks.
The result simplifies Facebook's multi-pronged effort to take on Snapchat's Stories format, which displays photos and videos shared in chronological order that disappear after 24 hours. The new feature allows members to contribute Stories that can only be viewed by the members of the group or event, a flawless feature for private functions such as parties, and weddings. You'll be able to post a Story to either Messenger or Facebook and your Facebook friends and the people you chat with on Messenger will be able to see that Story.
The Stories format was originally a unique aspect of Snapchat, which has seen a noticeable decline in user growth since the feature was added to Instagram. Facebook page administrators will have the ability to post Stories to their followers as well in the coming months. Now that Messenger and Facebook Stories are connected, Facebook is hoping the feature will cause less confusion around when people should post in the different apps.