Lewis Hamilton looked pretty pleased with life as he spoke at the launch of his new Mercedes Formula One car on Thursday, but it was hard to know whether his relaxed, chatty demeanour was caused by good feelings resulting from a few exploratory laps earlier in the day or by the need to put on a cheerful face for the 50,000 fans tuning in to the Instagram feed from his iPhone, which was propped on a nearby table to provide live monitoring of the press conference.
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