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The country has not confirmed that it has actually blocked Google services, but censorship is the likely culprit as the 25th anniversary of the uprising nears.
Google's data shows Gmail traffic slowly rising again in China after a four-day outage.
The world's largest e-mail service has been almost entirely blocked months after China began efforts to eradicate it, according to GreatFire.org.
The Big G's executive chairman has responded to recent controversy over privacy and taxation.
The Facebook-owned photo sharing app appears to be the latest victim of online censorship in China.
The privacy-focused website is no longer available to users in mainland China, though its CEO isn't exactly sure why.
The social network's Chinese website blocks objectionable content globally -- a policy the company says it is "strongly considering changing."
The new operating system is expected to launch initially on desktops in October, with support for mobile devices coming later.
Wielding your own leg like a gun is the latest hot thing for selfies -- started by Chinese artist and activist Ai Weiwei.
American tech firms are caught in the cross-fire between China and the US over cyberespionage. International politics specialist Shen Yi says this storm isn't likely to blow over soon.