The Like Button is the quickest way for people to share content with their friends. A single click on the Like button will 'like' pieces of content from your app and share them on Facebook.

The Like Button can be used to like a Facebook Page or any Open Graph object and can be referenced by URL or ID.

At present, the feature is currently available on iOS third-party app developers and they can put 'Like Button' into their apps so that users can share content with their friends
The company also announced a new 'Message dialog' for mobile app developers to share content through Facebook Messenger.