san francisco twitter inc twtr.n say tuesday would add label election-related advertisements say behind threat regulation unite state lack disclosure political spend social media twitter act month facebook inc fb.o launch similar overhaul political ads say blog post would start website people could see identities buyers target demographics total ad spend election advertisers silicon valley social media firm political ads run websites generally free disclaimers regulatory demand u.s. authorities impose television radio satellite service call change grow however twitter facebook alphabet inc googl.o google say recent weeks russian operatives affiliate buy ads use fake name service spread divisive message run-up 2016 u.s. presidential election russia deny interfere election cite russia-linked ads facebook last month say first time would make possible anyone see political ads run facebook matter target attempt self-regulation facebook twitter satisfy lawmakers u.s. senator amy klobuchar say statement twitter announcement substitute update laws democrat co-sponsoring legislation would make disclosures mandatory twitter say change would take effect first unite state globally new approach ads would visible people twitter feed election ads would label promote political account company say make clear see engage electioneer ad require electioneer advertisers identify campaign bruce falck twitter general manager revenue product say blog post twitter say would limit target options election ads although say introduce strong penalties election advertisers violate policies company say would also allow people see ads currently run twitter election-related otherwise twitter late move would tackle longstanding problem fake abusive account users lawmakers also blame influence last year u.s. election unlike facebook twitter allow anonymous account automate account bots make service difficult police transparency solution deployment bots amplify fake mislead content successful efforts online troll promote divisive message representative adam schiff top democrat house intelligence committee say statement twitter say last month suspend 200 russia-linked account investigate online efforts influence last year election general counsel facebook google twitter schedule testify next week senate house intelligence committees twitter label election ads u.s. regulatory threat