LONDON, ENGLAND - NOVEMBER 24:  The 'Tinder' app logo is seen amongst other dating apps on a mobile phone screen on November 24, 2016 in London, England.  Following a number of deaths linked to the use of anonymous online dating apps, the police have warned users to be aware of the risks involved, following the growth in the scale of violence and sexual assaults linked to their use.  (Photo by Leon Neal/Getty Images)