Verbier is a small ski resort town, about 2 hours from Geneva, near the Italian border. It's a gorgeous area that has attracted a lot of tourists and foreign investors. The result has been bartenders, waiters and salespeople who only speak English.
Although the Facebook group was started by a 23-year-old kid "for a laugh," it's grown to over 600+ members, and "A Verbier on parle français" stickers have started appearing around town.
If you've got a message that resonates, it will advertise itself.