Besides tendencies, In addition there are road blocks marketers could encounter when applying a social media system:?? ????????? ????? ???? ??? ?? ?? ???????????? ??????? ??? ?? ???????????? ????? ?????????? ??? ??? ???? ???? ??? ???? ????? ??????? ??? ????? ???. ?????? ???? ???????? ?????? ???????? ?? ????? ??? ????????? ?????????????? ???? ?? ???