Freedom of speech and opinion is a non-negotiable thing, to tackle it is to attack democracy. Expect a massive frontal reaction from us because the struggle for the defense of those freedoms is the foundation of our movement.

It's not clear if this effort by Anonymous members is an official Anonymous action. Anonymous has no central committee, no leaders, no hierarchy, no defined roles. Anyone can say they are Anonymous. However, the effort is being publicized in several countries and languages.

Mashable notes:

#OpCharlieHebdo hasn't received any endorsements from the more well-known Anonymous Twitter account @YourAnonNews.

On a related note, Barrett Brown will be sentenced on January 22. Some say journalists should be "chilled to the bone." (Personally, I think the two years he's been in pretrial confinement are more than an adequate punishment for his offenses.)

At a hearing the Government alleged Anonymous was an "anarchist hive." They tried to use Brown's statements to the effect he was a leader of Anonymous against him.

When questioned on whether Anonymous was an Anarchist hive Brown answered, “Anon does not like to define itself and my Anarchism is my own.”

So, as with Barrett Brown' past claims to be a leader of Anonymous (which he later said were not true) the Anonymous effort to take down jihadist websites, like previous threats Anonymous has made against ISIS, are coming from individuals, not a central command. It could involve 50 people, or 5,000. There's really no way to know.