First of all, there are so many materials available in French to students and teachers today, it's great to know what's out there. Secondly, especially for teachers, who ordinarily have a limited budget, it's important to be able to try something before buying it. So many times I have found something (a song, a video) and used it in my classroom to decide that I would buy it. Unfortunately, many of these items are not available for purchase worldwide. Teachers and students can access these in their home countries via the internet.
Je suis professeure de français dans un collège aux États-Unis. J'ai commencé par créer des blogs (privés) pour mes élèves. Et maintenant, j'ajoute un nouveau blog pour bien organiser les matériaux trouvés sur le web. C'est plutôt pour moi et mes collègues.