???? ?????? ??? ????????? ? ??? ????????? ??? ?????????? ??? ??? ????????.Employed by Fb to provide a series of advertisement products and solutions like actual time bidding from third party advertisers.?? ???????????? ???????? ??? ????? ??? ????????? ?? ?? ?????????? ?? ?????????? ???????? ??? ?? ??????? ??? ?? ??????? ??????????? ?? ?????? ??????