Salesforce Chatter allows the advantages of social networking to work for your business. It is the ultimate collaboration software solution that connects people and information at the speed of social. Productivity? Check. Innovation? Done. Knowledge-sharing? Got it.
The TrackedChange type is used whenever a field on a record, previously identified during Chatter Feed Tracking configuration, is updated. In addition to the FeedItem being created, a FeedTrackedChange record is also created, including both the old and new value of the field.