The passing of expanded anti-terror laws in federal parliament on Thursday evening has sparked a flurry of social media activity as critics flocked to Twitter to parody the nation's top security body.

#HeyASIO was the most popular hashtag in Australia on Twitter at midday on Friday, according to the micro-blogging site's official rankings. It is a take on the popular 'Hey, girl' posts associated with actor Ryan Gosling.

A Twitter user pokes fun at Prime Minister Tony Abbott's recent comment that 'all you need to carry out a terrorist attack is to have a knife, an iPhone and a victim'. Credit:twoih.com

Hashtags allow users to filter topics on various social media platforms, with "trending" tags pointing to the most popular at a certain time.

The Senate passed the National Security Legislation Amendment Bill (No. 1) 2014 44 votes to 12, with bipartisan support from Labor.