▁their ▁readers ▁see ▁all ▁aggreg ated ▁content ▁once ▁subscri bed . ▁In ▁the ▁reader - init i ated ▁systems ▁( such ▁as ▁Windows ▁Phone ▁ 7 ▁people ▁hub ▁and ▁Linked ▁Internet ▁UI ), ▁the ▁readers ▁combine ▁the ▁ident ities ▁of ▁others , ▁which ▁has ▁no ▁impact ▁on ▁the ▁publish ers ▁or ▁other ▁readers . ▁The ▁publish ers ▁can ▁still ▁keep ▁separate ▁ident ities ▁for ▁different ▁readers . ▁ ▁Techn ically , ▁the ▁aggreg ation ▁is ▁enabled ▁by ▁APIs ▁provided ▁by ▁social ▁networks . ▁For ▁the ▁API ▁to ▁access ▁a ▁user ' s ▁actions ▁from ▁another ▁platform , ▁the ▁user ▁will ▁have ▁to ▁give ▁permission ▁to ▁the ▁social - aggreg ation ▁platform , ▁by ▁specifying ▁the ▁user - id ▁and ▁password ▁of ▁the ▁social ▁media ▁to ▁be ▁synd ic ated . ▁This ▁concept ▁res emb les ▁open ▁ID . ▁In ▁March ▁ 2 0 0 8 , ▁The ▁Econom ist ▁reported ▁that ▁social ▁network ▁services ▁are ▁only ▁beginning ▁the ▁move ▁away ▁from ▁" w alled ▁gard ens " ▁to ▁more ▁open ▁architect ures . ▁ ▁Some ▁sites ▁are ▁working ▁together ▁on ▁a ▁" data ▁port ability ▁work group ", ▁while ▁others ▁are ▁foc using ▁on ▁a ▁single ▁sign - on ▁system ▁called ▁Open ID ▁to ▁allow ▁users ▁to ▁log ▁on ▁across ▁multiple ▁sites . ▁ ▁Histor ically , ▁the ▁tr end ▁from ▁private ▁services ▁to ▁more ▁open ▁ones ▁can ▁be ▁seen ▁across ▁many ▁Internet ▁services ▁from ▁email ▁and ▁instant ▁mess aging ▁to ▁the ▁move ▁that ▁early ▁online ▁service ▁prov iders ▁made ▁to ▁become ▁websites