WhatsApp is already starting to enact features similar to Facebook.
Now, the messaging app acquired by Facebook has checkmarks to show that a message has been read. It also shows when a message has been delivered.
WhatsApp wrote about this in the Q&A section:
In a group chat, the second check marks will appear when all participants in the group have received your message. The two blue check marks will appear when all participants in the group have read your message.
If you only see a single check mark next to your message, there is likely nothing wrong with WhatsApp or your phone. There may be several reasons why your message has been sent, but not delivered to your chat partner:
Their phone might be off.
They could be sleeping, especially if they live in a different time zone.
They might be experiencing network connection issues.
They might have seen the notification on their screen, but did not launch the app (especially common if the recipient uses an iPhone).
They might have blocked you. For more information read this article.
Readers: What other features from Facebook would you want to see in WhatsApp?