The Graph API Webhooks feature allows apps to receive real-time notifications of changes to selected pieces of data from the Graph API. It allows your to app to receive notifications whenever there are updates to a chosen set of topics and their fields. This API has a version 4.0 update, the like Webhooks field for Page Feed has been deprecated. Page likes will now be delivered by the reactions Webhooks fields. Facebook Developers enables you to build, grow and monetize amazing apps.