A group of Jewish students in France is taking on one of the giants of the internet - Twitter.
They want the micro-blogging site to reveal the names of people who post anti-Semitic tweets so they can be prosecuted for hate crimes.
But as both sides appeared in a Paris courtroom on Tuesday, Twitter said it could not hand over data without permission from US authorities.
Al Jazeera's Tim Friend reports.
Source: Al Jazeera