The US warning comes after German and British authorities previously warned their citizens that Beijing is using LinkedIn to try to recruit them as spies.
Internet watchdog Citizen Lab has so far counted some 175 targets of NSO – an Israeli surveillance company – spyware worldwide.
Prime Minister Theresa May said it is "highly likely" that Moscow was responsible for the poisoning of former Russian double agent Sergei Skripal and his daughter. Russia called May's statement a "circus show."
Sergei Skripal, who passed Russian secrets to Britain, and his daughter Yulia, have been in intensive care since they were found slumped unconscious on a bench last week in Salisbury.
Sergei Skripal, once a colonel in Russia's GRU military intelligence service, and his 33-year-old daughter, Yulia, were found slumped unconscious on a bench outside a shopping centre in the southern English city of Salisbury on Sunday afternoon.
Speaking in the House of Commons, UK Foreign Secretary Boris Johnson says if state involvement was proven, Britain will take action.
Sergei Skripal, once a colonel in Russia's GRU military intelligence service, was convicted in Russia of treason in 2006 but exchanged as part of a Cold War-style spy swap in 2010.
Two soldiers who were detained on grounds of attempted military espionage and entering a prohibited military zone in Turkey say they had lost their way and crossed the border due to bad weather.
The FBI representative was summoned after Huseyin Korkmaz, a fugitive and former Turkish police supervisor, said he received financial help from the bureau. Korkmaz was testifying in the US case against Halkbank executive Mehmet Hakan Atilla.
A retired FBI agent says he has high hopes of solving one of the biggest World War Two mysteries in the Netherlands with the help of modern policing techniques.
Charges have been brought against 94 individuals including the country's former security and counterintelligence chief as part of anti-corruption clampdown.
A group of prominent journalists and activists say their phones were hacked by the government using Israeli spyware sold exclusively to the state.
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