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A premium email service has been slammed for letting users track other people's locations simply by sending a message. It's not a new issue, but has raised legal and ethical questions. The email service is called Superhuman and costs $30 a month. ... That covers a host of features, such as being able to "unsend" a message before its read, plus an "artificial intelligence" tool to decide and highlight which incoming messages are most important. While reviewers are split between whether it's a fantastic service for power users or just a jumped-up Gmail, one designer has laid into Superhuman for a ... (view more)