Whatsapp again adds a new feature which will let you to star messages to view later. This is really a very good feature which comes in more handy while saving links or important messages. Precently whatsapp has 900 million users.
To star or bookmark any messages/chat simply open the conversation, then give a long press. You can see a Star icon on the top, tap on it and your messages has been saved. In order to view the Starred messages, go back and hit on menu then select Starred messages.