Salut Lélia,
On en parle ici:
https://forum.latranchee.com/t/je-viens-de-lire-ceci-facebooks-updated-news-feed-will-make-organic-post-reach-nearly-impossible/5937
et ici:
https://forum.latranchee.com/t/une-catastrophe-nous-attend-elle-avec-facebook/5821