Speakers can be ethnic Serbs, Bulgarians and Macedonians, mostly depending on their country of origin, although there is a Torlak-speaking Bulgarian minority in Serbia (the Western Outlands) and a corresponding Serbian one in the north of the Republic of Macedonia).
The so-called Molise Slavic language is a dialect spoken in three villages of the Italian region of Molise by the descendants of South Slavs who migrated there from the eastern Adriatic coast in the 15th century.
Because these people have migrated away from the rest of their kinsmen so long ago, their diaspora language is rather distinct from the standard language, and rather influenced by Italian.
those associated with the Orthodox Churches - most Russians, most Ukrainians, most Belarusians, some Carpatho-Ruthenians (Rusyns), most Serbs, most Bulgarians and most Macedonians
those associated with the Catholic Church (both Roman Catholic and Greek Catholic) - Poles, some Sorbs, some Czechs, most Slovaks, Croats, Slovenians, some Ukrainians, a few Serbs, a few Macedonians and some Belarusians
The Orthodox/Catholic religious divisions become further exacerbated by the use of the Cyrillic alphabet by the Orthodox and Uniates (Greek Catholics) and of the Roman alphabet by Roman Catholics.