WhatsApp being used to orchestrate ethnic cleansing in Mynanmar [0], or inciting lynchings in India [1] would be two recent examples of tools that remove barriers to communication having unexpected and tragic side effects.

[0] https://www.vice.com/en_us/article/8xbbqg/facebook-hired-an-...

[1] https://www.theguardian.com/technology/2018/jul/20/whatsapp-...