To do so could widen the reach of the campaign because only about 30 million of Indonesia's 230 million people have access to the internet.

Police said they suspect the attacks two weeks ago were carried out by Islamic extremists linked to Jemaah Islamiyah, a regional militant group blamed for a string of deadly bombings in Indonesia this decade, notably the 2002 Bali bombings, in which 202 people were killed.

No suspect has been arrested in the latest bombings, but police have launched a nationwide hunt for Malaysian-born fugitive Noordin Mohammed Top, who is believed to be the leader of a violent Jemaah Islamiyah splinter group.

Noor Huda Ismail, an expert in Islamic militancy in Indonesia, said the IndonesiaUnite campaign signalled increasing willingness among Indonesians to openly confront radicalism.

'In the past, there was silence and the voice of the moderate majority was drowned out by the radical minority fringe,' Noor Huda said. 'It's good to see that people speak up. It's fascinating.'

Militants have also used the internet to get their message across.

An internet statement purportedly signed by Noordin on behalf of a group calling itself Tandzim Al-Qaeda Indonesia said the hotel attacks targeted 'top businessmen and intelligence operatives linked to the US economy' bent on 'plundering Indonesia's resources'.

The statement, posted on the internet blog mediaislam-bushro.blogspot.com, said the attacks were tributes to two militants killed in police raids in 2005 and 2006, bomb-maker Azahari bin Husin and Jabir. Experts said they were unsure whether the statement is authentic.

Indonesia's anti-terrorism police force, which has received assistance from Australia and the US, has not only won praise for its crackdown on militants involved in past attacks but also for its de-radicalisation approach, which includes employing reformed militants to wean radicals away from terrorism.