As the NBN debate continues to rage on in Australia, a coalition of US tech companies and advocacy groups is calling for the expansion of Wi-Fi, arguing its airwaves are getting too congested.

Apple has, for the first time, joined rivals Google and Microsoft in disclosing the number of information requests it received from the world's governments, as controversy still swirls around US surveillance on citizens both there and abroad.

The Boston bombings back in April caused a flood of information and chatter on social media, but only 20% of tweets proved accurate according to new research.