Almost half of Facebook’s impressive revenue growth and turnover is still reliant on the US, where user growth has slowed down

Among GAFA platforms, Facebook’s core business is the one most directly dependent on dwell time, but the metric for the crucial home market is clouded in mystery

The company has yet to create significant compensating revenue streams outside display advertising, raising the importance of international markets for Facebook’s future

Happy Birthday iTunes! It is just over a year since Apple launched iTunes and the media continues to talk up the second coming of the music industry, whose saviour appears in the form of affable Steve Jobs. iTunes sold a total of 70 million tracks online in its first year, well below its target of 100 million, but a respectable showing, especially since it spawned a small flock of competitors determined to out-sell iTunes.