It will probably help if people take the time to read Article 8 in the European Declaration of Human Rights:

    Article 8 – Right to respect for private and family life

    1. Everyone has the right to respect for his private
       and family life, his home and his correspondence.

    2. There shall be no interference by a public authority
        with the exercise of this right except such as is in
        accordance with the law and is necessary in a
        democratic society in the interests of national
        security, public safety or the economic well-being
        of the country, for the prevention of disorder or
        crime, for the protection of health or morals, or
        for the protection of the rights and freedoms of others.
 

Thus a channel where terror actions are planned /can be made/ "against the law", but it will not automatically be so, unless there is a specific french law that makes it so.