By Matt Smith DUBAI (Reuters) – Saudi Arabia plans to regulate local companies that screen shows on YouTube, a senior official was quoted as saying in local media on Tuesday – a move that could stifle its nascent creative industries. The kingdom is the worlds top per capita user of YouTube. But YouTubes popularity has now brought Saudi Arabias homegrown production houses under the gaze of the General Authority for Audiovisual Media, a recently formed watchdog. Riyadh Najm, the Authoritys president, told the pan-Arab newspaper Asharq al-Awsat that his organization would soon issue a manifesto to organize – or regulate – the work of YouTube channels.