There is no fair context for that under the law. The name is trademarked so unless you have approval from Facebook to use their trademark then using it is not legal. It's not that complicated.
Maybe domain names are treated differently from book titles, but I don't see why they should be. There certainly is fair use of trademarks in book titles if the use is descriptive, not likely to lead to confusion about who produced the book, and can't be effectively replaced with a more generic term. E.g. "That Popular Graphics Editor for Dummies" isn't a sensible substitute for "CorelDRAW! for Dummies".
