The articles tells a story of a “worldwide network of friends included over 150 members, speaking 20 different languages, who scanned every post Steven has made on Facebook or Twitter and removed any mentions of his Israeli or Jewish connections.” I can only think of one Jewish organization that could facilitate such an grand scale operation and it isn't JVP.
We also learned yesterday that Sotloff spent 3 years at the Interdisciplinary Center in Herzliya. An institute that is linked to the Mossad according to some media sources.