An analysis of 3,840 Instagram photos from New York, London, Berlin, Moscow, Bangkok and Sao Paulo - 640 for each city -- found that just four per cent of then were actually selfies.
As part of a study, young couples revealed different condom negotiation strategies to cope with unprotected sex.
Scientists have developed a novel psychological "vaccine" to immunise the public against the damaging "virus" of fake news and misinformation on websites and social media.
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