Mr Shapira said he had reported 150 comments to Facebook during the same six-month period, and 80% were removed within one to three days.
Twitter’s head of public policy for Europe, Karen White, told Reuters: “Over the past six months, we’ve introduced a host of new tools and features to improve Twitter for everyone. We’ve also improved the in-app reporting process for our users and we continue to review and iterate on our policies and their enforcement.”
The site is said to be acting against 10 times as many abusive accounts as it did this time last year.
He copied 12 selfies snapped at the memorial from social media, and published them on a website called “Yolocaust” – a combination of the popular social media hashtag Yolo – “you only live once” – and Holocaust.
Each image was altered so that hovering over it stripped away the background of the memorial and replaced it with scenes from concentration camps.
He said at the time: “Lets see what happens, let’s see how many stupid, inappropriate pictures I have to see on the internet.
“And if you’re asking me is this right or wrong, then that’s a good thing. It doesn’t have to be one or the other, just having the debate is good.”