JAKARTA (REUTERS) - A Facebook official apologised to Indonesian members of parliament on Tuesday during a five-hour grilling at a public hearing on issues ranging from the misuse of personal data to the oversight of content by the social media giant.

Facebook has been hit by revelations that data of 87 million users were improperly accessed by political consultancy Cambridge Analytica, which worked on US President Donald Trump's campaign.

Indonesians are among the world's biggest users of Facebook and authorities in the Southeast Asian country have demanded answers from the company on how personal data of its citizens was shared with Cambridge Analytica.

In a statement read out at the hearing, Facebook's head of public policy in Indonesia said that 1,096,666 people in Indonesia may have had their data shared, or 1.26 per cent of the global total, after 748 people took an app-based personality quiz.

"I truly apologise for this...I hope our answers can satisfy you," Ruben Hattari told MPs from a parliamentary committee.

At the hearing, Simon Milner, Facebook's Asia-Pacific vice president of public policy, said the company had deleted the app developed by academic Aleksandr Kogan and ordered Cambridge Analytica to delete any data it may have helped harvest.

Some of the MPs also focused on allegations that Facebook users' personal data was used in online campaigns to play a role in US President Donald Trump's 2016 election victory.

"Can you convince me that what happened in the US won't happen here in this year of regional elections?" asked Evita Nursanty, an MP from the Indonesian Democratic Party of Struggle (PDIP), referring to a series of upcoming local elections.

Another MP, Junico BP Siahaan, also from the PDIP, said that if Facebook could not control hoax news then Indonesia should have the right to close it.

Roy Suryo, an MP from the Democratic Party, said at the hearing that parliament and the government were in the process of making a new law on data privacy protection.

"Tell Mark Zuckerberg Indonesia will implement a new law on protection of data privacy and Facebook must abide by it," said Suryo, referring to the chief executive of Facebook.

Indonesian police are investigating whether Facebook breached a government decree on private data protection and a law on electronic information and transactions.

Breaches of the law can include criminal sanctions with a maximum penalty of up to 12 years in jail or a fine of 12 billion rupiah (S$1.15 million).

Communications Minister Rudiantara has also said he wants more information from Facebook on how data sharing affected people in the country.

The minister told Reuters on Monday he had sent a second warning letter to Facebook over the issue.

Facebook said in an emailed statement last week: "We are strongly committed to protecting people's information, and we intend to make all the same privacy controls and settings available everywhere."

The company said it would "continue to work with privacy and information commissioners, and authorities, in Indonesia".