There's no doubt Apple's announcement about the iPhone 4S, the next iteration of its smartphone, was the most-talked about tech topic on Twitter this week. But it wasn't all about Tim Cook and the shiny new device. Online banking fraud, BT's boost to fibre broadband speeds and a camera simulation site were also pretty hot topics on the micro-blogging site. Here's how our five favourite tweets from the past seven days.

Apple iPhone 4S launch

It's been the most-talked about smartphone for the best part of this year, and so yesterday we were in a frenzy of excitement when Apple finally unveiled the iPhone 4S. Yup, you heard us right, not the iPhone 5 like we'd all expected. Editor MattJEgan was on hand to give us the news from Apple's event.
"Definitive iPhone 4S details," he tweeted.

Online banking fraud drops by 32%

Online banking fraud has fallen by almost a third since last year, says the UK Cards Association. According to the organisation, £16.9m was lost due to online banking fraud between January and June this year, that's a 32 percent decrease on figures for the same period in 2010.
"Get in there! 'Online banking fraud drops by 32%'," we said in a tweet.

BT boosts fibre download speeds to 300Mbps

BT has revealed its fibre broadband service will offer speeds of 'up to' 300Mbps in some areas from next year. The telecoms company is currently in the process of rolling-out a £2.5bn fibre network across the UK in a bid to give two thirds of the UK access to fibre broadband by 2015. Locations where fibre-to-the-premises (FTTP) technology has been rolled-out will be able to benefit from the faster download speed from spring.
Deputy news editor CarrieSkinner said: "BT boost fibre download speeds to 300Mbps".

Twitter's iPad app exposes users' accounts

Users of Twitter's iPad app risk leaving their account exposed, after a PC Advisor test showed people's status and bio can be updated despite them being signed in to the app with old credentials.
"Uh oh...'Twitter's iPad app exposes users' accounts'," we tweeted.

Play with an online simulator to learn camera settings

We uncovered a great website, CameraSim, which simulates the operation of a digital SLR . You can use it to tweak the settings and teach yourself how ISO, shutter, aperture, and other settings affect your photos and even see the results instantly
"Cunning! A camera simulator that helps you understand camera settings," tweeted Associate editor RosieHattersley.