Whatsapp tricks

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http://androidforums.com – Hi I got few questions about WhatsApp: 1)sometimes some group members leaves the group, and still sending messages.They aren't in the group but they still do. How do they do it? 2)sometimes a group member shares a photo, which its preview (the tiny picture in the chat screen) is different from the photo which are shown, when I enlarge it. How does he do it? (General)