If Reuters is asking, you know the answer. Espionage, by its very nature, knows no bounds. Social networks are already under scrutiny by employers, jilted lovers, stalkers, and others. Why wouldn’t spy agencies be right there, too?
Take note that the article mentions states with a history of “extrajudicial killings and other human rights abuses.” As it is at home, so it is abroad. Amerikkkan History 101.
Should spies spend more time on Twitter? http://www.reuters.com/article/internetNews/idUSTRE71726I20110208