As to language, this is from Wikipedia:
Italian was the official language of Corsica until the 9th of May of 1859,[28] when it was replaced by French. Corsican (Corsu), a minority language that is closely related to medieval Tuscan (Toscano), has a better prospect of survival than most other French regional languages: Corsican is in fact, after French (Français), the most widely spoken language on the island. However, since the annexation of the island by France in the 18th century, Corsican has been under heavy pressure from French, and today it is estimated that only 10% of Corsica's population speak the language natively, with only 50% having some sort of proficiency in it.[29]
The language is divided into two main varieties: Cismuntanu and Ultramuntanu, spoken respectively northeast and southwest of the Girolata - Porto Vecchio line. This division was due to the massive immigration from Tuscany which took place in Corsica during the lower Middle Ages: as a result, the Cismuntanu became very similar to the Tuscan dialects, being part of the Italo-Dalmatian language group, while the Ultramuntanu could keep its original characteristics which make it much more similar to a Southern Romance language like Sardinian (Sardu).[30][31] Therefore, due to the differences between the main dialectal varieties, many linguists classify Corsican as an Italo-Dalmatian language,[32] while others consider it a Southern Romance one.[33]
It should also be noted that fewer and fewer people speak a Ligurian dialect, known as bunifazzinu,[34] in what has long been a language island, Bonifacio. In Cargèse, a village established by Greek immigrants in the 17th century, Greek (Ελληνικά) was the traditional language:[35] whereas it has long disappeared from spoken conversation, ancient Greek is still the liturgical language and the village has many Greek Orthodox.