By Angus McDowall RIYADH (Reuters) – Syrias civil war has led to a new, greater threat of Islamist radicalism in Saudi Arabia that requires a more aggressive war of ideology on the Internet, says the man responsible for online monitoring in the kingdom. Remarks by the head of the Saudi Ideological Security Directorate (ISD) suggest that the unit, known for keeping tabs on liberal activists and women drivers as well as Islamist extremists, is turning its focus increasingly towards those using the Internet to recruit fighters for jihad abroad. This month King Abdullah decreed that any Saudi who goes overseas to fight faces jail terms of 3-20 years. Authorities believe 1,000-2,000 of the kingdoms citizens have gone to Syria to join the war there.