Employed by Fb to provide a series of advertisement items for instance true time bidding from third party advertisers.?? ??????? ??? ????? ??? ?? ????? ??? ??????? ????? ???????????? ?????????? ??? ????????? ??? ????????????? ??? ??? ?????? ??? ??? ?????.??????? ?????????? ??? ???????????? ??????? ??????????? ?????????.???????????? ???????? ???????