There has been many ways of communicating through out the year. Now days we have the cell phone, the telephone and other social sites to communicate. But before these modern technologies there was smoke signals and "hollerin" Hollerin is a lot like yodeling and is thought to have originated among rural folks prior to modern technology.
Hollerin continues but now days is done for fun or competing in contest. The folks at Spivey's corner in North Carolina keeps the age old habit of hollerin alive. With contest in June and a few in September.