Some of the most widely used messaging apps in the world, including Google Hangouts, Facebook chat, Yahoo Messenger and Snapchat, flunked a best-practices security test by advocacy group the Electronic Frontier Foundation (EFF).

The organization evaluated 39 messaging products based on seven criteria it believes such tools should meet in order to ensure the privacy and security of digital communications.

The reviewed products included mobile texting apps, instant messaging clients, voice and video calling software and email services. The results were published Tuesday under the form of a Secure Messaging Scorecard.

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