Chakavian
Chakavian in its actual use is the least spoken Serbo-Croatian dialect, being spoken only by 12% Croats. It is now mostly reduced in southwestern Croatia along the eastern Adriatic: Adriatic islands, and sporadically in the mainland coast, with rare inland enclaves up to central Croatia, and minor enclaves in Austria and Montenegro. All areas of old contacts with Romance languages.
Serbian Cyrillic alphabet
Cyrillic is in official use in Serbia, Montenegro and Bosnia and Herzegovina. Although the Bosnian language "officially accept[s] both alphabets", the Latin script is almost always used in the Federation of Bosnia and Herzegovina, whereas Cyrillic is in everyday use in Republika Srpska (and is used only by the Serbs in the country). The Serbian language in Croatia is officially recognized as a minority language, however, the use of Cyrillic in bilingual signs has sparked protests and vandalism.