The economy and asylum seekers were the most talked-about issues among Facebook's nine million Australian users during the fiery second leaders' debate.

Activity on social media sites ramped up on Wednesday night as voters followed the heated, hour-long contest online and on television.

The most-discussed topic on Facebook during and shortly after the debate was the economy - suggesting that is the key election issue among the site's whopping pool of users.

Facebook released data this week showing it has more than nine million daily users in Australia - about 40 per cent of the population.

The company did not release data showing how many people commented on the debate on Wednesday night, just the general trends.

The second most discussed topic was asylum seekers, followed by same sex marriage, climate change and paid parental leave.

Opposition Leader Tony Abbott scored more mentions on Facebook than Prime Minister Kevin Rudd during the debate.

The dominant sentiment expressed about either men was not clear - though the data suggests interest in Mr Abbott grew after he uttered his "does this guy ever shut up?" comment to Mr Rudd about halfway through the contest.

Twitter, which is estimated to have just over two million Australian users, did not release data from the second leaders' debate, though it's clear there was significant activity on the site.

During the first leaders' debate, the most-discussed topics on Twitter were same sex marriage, the budget and the national broadband network.

Mr Abbott also scored more mentions on Twitter during the first debate, though again, the dominant sentiment was not clear.

 

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