berlin germany intelligence service publish detail social network profile say front fake chinese intelligence gather personal information german officials politicians bfv domestic intelligence service take unusual step name individual profile say fake fake organizations warn public officials risk leak valuable personal information via social media chinese intelligence service active network like linkedin try extract information find intelligence source way include seek data users habit hobbies political interest say nine months research find 10,000 german citizens contact linkedin professional network site fake profile disguise headhunters consultants think-tankers scholars bfv say could large number target individuals fake profile yet identify add speak beijing monday chinese foreign ministry spokesman lu kang say accusations baseless hope relevant german organizations particularly government departments speak act responsibly things beneficial development bilateral relations lu say among fake profile whose detail publish rachel li identify headhunter risehr alex li project manager center sino-europe development study many profile picture show stylish visually appeal young men women picture laeticia chen manager china center international politics economy nick online fashion catalogue official say reuters review profile show connect senior diplomats politicians several european countries way establish whether contact take place beyond initial social media add warn reflect grow concern european western intelligence circle chinese covert activities countries follow warn u.s. central intelligence agency attempt economic giant security service recruit u.s. citizens agents bfv invite concern users contact encounter social media profile seem suspect german intelligence unmask allege covert chinese social media profile