As it is now, Web companies not only have the ability to provide diabolically precise demographic targeting to political campaigns, they can also make such offers exclusively.
( ( ( As ( it ( is now ) ) ) ( , ( ( Web companies ) ( ( not only ) ( have ( the ( ability ( to ( provide ( ( ( diabolically precise ) demographic ) ( targeting ( to ( political campaigns ) ) ) ) ) ) ) ) ) ) ) ) ) ( , ( they ( ( ( can also ) ( ( make ( such offers ) ) exclusively ) ) . ) ) ) )
(ROOT (S (S (SBAR (IN As) (S (NP (PRP it)) (VP (VBZ is) (ADVP (RB now))))) (, ,) (NP (NNP Web) (NNS companies)) (ADVP (RB not) (RB only)) (VP (VBP have) (NP (DT the) (NN ability) (S (VP (TO to) (VP (VB provide) (NP (NP (ADJP (RB diabolically) (JJ precise)) (JJ demographic)) (VP (VBG targeting) (PP (TO to) (NP (JJ political) (NNS campaigns))))))))))) (, ,) (NP (PRP they)) (VP (MD can) (ADVP (RB also)) (VP (VB make) (NP (JJ such) (NNS offers)) (ADVP (RB exclusively)))) (. .)))
Web companies use targeted demographics to inform politicians campaigns. 
( ( Web companies ) ( ( use ( ( targeted demographics ) ( to ( inform ( politicians campaigns ) ) ) ) ) . ) )
(ROOT (S (NP (NNP Web) (NNS companies)) (VP (VBP use) (S (NP (JJ targeted) (NNS demographics)) (VP (TO to) (VP (VB inform) (NP (NNS politicians) (NNS campaigns)))))) (. .)))