???? ?????? ??? ????????? ? ??? ????????? ??? ?????????? ??? ??? ????????.Employed by Facebook to provide a series of advertisement items for example real time bidding from 3rd party advertisers.?? ???????????? ???????? ??? ????? ??? ????????? ?? ?? ?????????? ?? ?????????? ???????? ??? ?? ??????? ??? ?? ??????? ??????????? ?? ?????? ?????????.????