WhatsApp

A new update has been rolled out to WhatsApp that lets users see when the person they are talking to reads a message. The check marks that appear next to messages to indicate that a message has been successfully sent and successfully delivered now have a third indicator mode. A double blue check mark means that the message has been read.

WhatsApp took the messaging world by storm when it first appeared on the scene. Despite having been found to be one of the most insecure messaging tools out there, it remains incredibly popular with around 600 million monthly users. WhatsApp's impact was such that Facebook parted with $19 billion to buy it, and this month the service celebrates its fifth birthday.

Secure communication is something we all crave online, particularly after Edward Snowden's NSA revelations increased public interest in privacy and security. With dozens of messaging tools to choose from, many claiming to be ultra-secure, it can be difficult to know which one to choose and which one to trust. Electronic Frontier Foundation (EFF) has published its Secure Messaging Scorecard which rates a number of apps and services according to the level of security they offer.

It's a fairly exhaustive list that includes numerous well-known names, as well as several more niche products. What is concerning, however, is that many of the most popular tools -- WhatsApp, Yahoo Messenger, Skype, SnapChat, and Facebook chat -- received very low ratings for failing to protect users and their communication data.