World leaders backed keeping Greece in the eurozone and vowed to take all steps necessary to combat financial turmoil while revitalising a global economy increasingly threatened by Europe's debt crisis.

A strong earthquake has rocked large parts of northern Italy, causing at least four deaths and seriously damaging historic buildings such as churches, bell towers and a medieval castle.

Facebook co-founder and CEO Mark Zuckerberg has wed long-time girlfriend Priscilla Chan, announcing the nuptials through a status update on the social networking site.

Foreign Minister Bob Carr has wrapped up his high-level meeting in Beijing with the man who will become the second most powerful person in China.