Unless it's within the context of a news story about either of the companies, French media are no longer allowed to mention the names Facebook or Twitter.
The regulatory decree was issued on May 27. The rationale behind the decision? Apparently mentioning social networks like Twitter or Facebook by name goes against a 1992 decree prohibiting surreptitious advertising. Encouraging users to engage with the content creators or give their own feedback is “clandestine advertising” for the social networks themselves. (via mashable)
Pretty ridiculous if you ask me!