Once in 2008-2009 I accidentally found CSRF on vkontakte.ru (now vk.com, now it's very popular social network). I created post on Livejournal with image that lo

Once in 2008-2009 I accidentally found CSRF on vkontakte.ru (now vk.com, now it's very popular social network). I created post on Livejournal with image that loaded from my server, responding with redirect to CSRF URL that posted random phrase from logged in user to single discussion thread. It looked like hundreds of people doing dadaist discussion.