WhatsApp now shows when a message has been read in group

Check marks will appear next to each message you send. Here is what each one indicates:

• message successfully sent.
• message successfully delivered to the recipient’s phone.
• the recipient has read your message.

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.