I've come across this very weird phenomenon this week via a friend of mine who was targetted - of people taking non consensual of women eating on the tube and posting them on a website that has 35,000 members !! Very intrusive and weird that people can be encouraged to take secret photos and post them - and of women only. The group Level Up has started a petition asking Facebook to take it down (people have reported it but apparently it doesn't breach their rules)
act.welevelup.org/campaigns/facebook-womens-harassment/