disseminator

from WordNet (r) 3.0 (2006)

disseminator
    n 1: someone who spreads the news [syn: {propagator},
         {disseminator}]

from The Collaborative International Dictionary of English v.0.48

Disseminator \Dis*sem"i*na`tor\, n. [L.]
   One who, or that which, disseminates, spreads, or propagates;
   as, disseminators of disease.
   [1913 Webster]