It's been a busy seven days in tech, from RIM launching two new BlackBerry handsets and a music-streaming service, to O2 announcing a trial of 4G technology in London. These gave Twitter users plenty to talk about on the micro-blogging service. Here's our five favourite tweets of the week.

8.43 million Brits have never been online

Nearly 8.5 million Brits have never used the internet the Office of National Statistics (ONS) said this week. According to the research firm, 8.43 million equates to 16.8 percent of the UK adult population. With 82.9 percent of UK adults, or some 41.62 million, saying they've gone online, ONS said there's been a decrease of 299,000 UK adults that have never used the web compared to the previous quarter of the year.
"8.43m Brits (at least) won't read this article because...'8.43 million Brits have never been online'," we tweeted.

O2 launches 4G trial in London

O2 revealed this week it has started a nine-month trial of 4G mobile data in London. The trial, of the LTE (Long Term Evolution) network, is an extension of an existing scheme that started in Slough in 2009. O2 says it will offer faster downloads to up to 1,000 consumers and businesses. Most of the country will still have to wait until 2013, however.
Editor MattJEgan said: "O2 4G trial offers 50Mbps for some consumers, businesses".

Amazon Kindle Fire review

We finally got out hands on Amazon's highly-anticipated rival to Apple's iPad, the Amazon Kindle Fire and we thought we'd share our thought with our lovely readers.
"Here's an actual hands on review of the Amazon Kindle Fire for you. Spoiler: It's not that great," we said in a tweet.

Pure Highway 300Di in-car DAB radio

Pure unveiled the Highway 300Di, an in-car DAB device that upgrades 'almost any car radio' to accept digital radio broadcasts. The gadget, which is priced at £179.99 and is exclusively available from Halfords, comprises a compact interface box that can be installed in a discreet location, such as a glove box or behind the vehicle's dashboard, along with a glass mountable dual aerial which is fixed to both sides of the windscreen to obtain the best possible signal, and a removable controller unit and bracket, which is mounted to the dash and features an LED display that allows users to control the stations they're listening to.
Deputy News Editor CarrieSkinner tweeted: "Pure unveils Highway 300Di. Turn 'almost any car stereo' into a DAB radio."

RIM lunches BBM Music

This week, Research in Motion (RIM) made BBM Music, the cloud-based music sharing service based around BlackBerry Messenger, publicly available in the UK. The service, which was first launched in a closed beta trial in August this year, allows users to build a personal music profile of 50 songs that can be listened to on or offline on their BlackBerry handset. Furthermore, they can then share this profile with your friends by inviting them to subscribe to your list, which they can also listen to in full both on and offline. BlackBerry users can also join the BBM Music community and access the music profiles of all the other community members.
"RIM unveils BBM Music for BlackBerry," said Associate Editor RosieHattersley.