There are various dangers of public wi-fi access. Maybe you have seen in the media stories of some people whose personal data have been misused on the Internet: their life have been destroyed by some malicious people using their data on Facebook or other social networks. A TV show by French TV network France 2 called Envoyé Spécial has recently discussed this topic (the video below is in French).
Be careful when you connect to the Internet and please do not forget to protect your traffic!
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