It is known that serbs are probably not even 50% Slavic these days. 400 years of being Turkish serfs. http://en.wikipedia.org/wiki/Sclaveni
Most servs dont understand the cyrillic script alphabet invented by a serv for servs, but instead use the Croatian one, then call it servian. Vuk Karadzic's first dictionaries were so error filled, he had to travel outside of servia and start writing down how Croatians were speaking and writing.
A serb ethnicity didnt start until the serb church, which copied exactly Byzantine symbols then called them serbian. serbs were servs, slaves conscripted, yes men to be sent to perform Byzantine tasks, land of slaves-servs..lol some people. Even the Bulgarians pushed them around since day one, many serbs of today are of Bulgarian extraction. http://en.wikipedia.org/wiki/First_Bulgarian_...