How 'A Good Jew' Tweeted Its Way Into the Hearts of French anti-Semites

It all began last Wednesday when, according to media outlets in France, the hashtag #UnBonJuif on Twitter was rated the third most tweeted subject in France.

The phrase in question looks innocent enough at first glance: #unbonjuif - “A good Jew” in French.  

Who could guess that these three words would become a magnet for the ugliest kind of anti-Semitism? And now it is also a flashpoint in the ongoing debate over free speech on social networks - when does the free-for-all that happens on Facebook and Twitter cross the line into destructive...