WhatsApp: Blue Ticks tell you your message has been read by the recipient

WhatsApp, the world’s most popular messaging app recently celebrated its fifth birthday and has over 600 million users. If you are one of the WhatsApp users, you must have noticed a change in it since a couple of days. Some of the usual grey ticks you see next to your sent messages may have now t...
WhatsApp: Blue Ticks tell you your message has been read by the recipient