????????? ?? ???????? ??????????? ??????????? ????????? ?? ???? ?????????.Used by Fb to provide a series of advertisement items such as authentic time bidding from 3rd party advertisers.?? ???????????? ???????? ??? ????? ??? ????????? ?? ?? ?????????? ?? ?????????? ???????? ??? ?? ??????? ??? ?? ??????? ??????????? ?? ?????? ?????????.?? ??????????