International Women's Day, the Melbourne Cup and our nation's same-sex marriage decision were on the minds of Australian Facebook users in 2017, the social media site reports.

Facebook's Year in Review data has revealed these topics were among the most talked about by the site's 15 million Australian users this year.

International Women's Day came first on the top 10 list, which Facebook's director of policy for Australia and New Zealand Mia Garlick attributed to the rise of several prominent global women's rights movements.

"Conversation [was] driven by the Women's March [in the US], which ranked in the top 10 global list, as well as the #metoo movement," Garlick said.

Coming in second was the race that stops the nation, the Melbourne Cup. While many Australians turned to social media to share fashion finds and race tips, others took to the platform to protest against the impact of the race of the health of the horses.

While Australia's same-sex marriage debate was only the 11th most talked about topic on Facebook in 2016, this year's postal survey saw it jump to third place on the list, as Australians took to the platform to campaign and share their views.

Qantas came fourth after it highlighted the role of corporate Australia in the same-sex marriage debate.

The flying kangaroo also shared some big announcements, including the decision to base half of its Dreamliner fleet in Brisbane, Garlick said.

Several signature speeches, including one condemning One Nation leader Pauline Hanson for wearing a burka in the Senate, led to Attorney-General George Brandis being the sixth most talked about topic in Australia in 2017.

Meanwhile, in sport, the "fight of the century" between Floyd Mayweather jnr and Conor McGregor came in at number seven on the list, while Roger Federer's two grand slam wins stirred up enough chat for him to place ninth.

But it wasn't all good news that was trending in Australian feeds: the death of Soundgarden's Chris Cornell and Linkin Park's Chester Bennington were the fifth and eighth most talked about topics of 2017, respectively.

Many in Australia and across the world came together on Facebook to commemorate the Manchester attack, during which a homemade bomb killed and injured more than 100 leaving an Ariana Grande concert in May.

People coming together on Facebook during times of crisis was a global trend, with Hurricane Harvey and the Las Vegas shooting being two of the most talked about topics on Facebook worldwide.

Topics to make the global most-talked about list for 2017 also included the Super Bowl 51 and the total solar eclipse.

International Women's Day was also the most talked about moment on Facebook globally in 2017, with conversation about the day doubling compared with 2016.

The Women's March also made it onto the top 10 global list, while the #metoo campaign garnered about 4.7 million mentions within the first 24 hours worldwide.

Most talked-about topics in Australia 2017

1. International Women's Day.
2. Melbourne Cup.
3. Same-sex marriage decision.
4. Qantas.
5. Chris Cornell's death.
6. Attorney-General George Brandis.
7. Floyd Mayweather jnr/ Conor McGregor boxing match.
8. Linkin Park/Chester Bennington's death.
9. Roger Federer.
10. Manchester attack.