The instant messaging service WhatsApp has begun to inform users if their messages have been read, using a double blue tick on the right of each sentence sent.
So far, the messaging application of Facebook only indicated if the messages had come to the server (with a simple gray tic) or the recipient's phone (double gray tic).
The double blue tic adds to the symbolism of the service to indicate that the recipient has accessed the text sent.So far, the messaging application of Facebook only indicated if the messages had come to the server (with a simple gray tic) or the recipient's phone (double gray tic).
The move has been widely criticized on social networks for users who consider it an invasion of privacy.
Whatsapp is the most popular service IM world: last August, its founder Jan Koum, said he already has 600 million active users.
Other instant messaging services such as Line or Telegram, and have long had the read receipt messages.
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