Who: Marina & the Diamonds (@marinasdiamonds)
Why?: As well as being a talented and gorgeous individual, burgeoning pop star Marina is also a genuinely nice person. It’s interesting to watch such a person become a pop star, which trust us, despite her tweet below, she will be by summer 2010.
Sample Tweet: “Can’t wait to be deemed the failure of 2010 ya’ll! Off to Hollywood to become an uber hot socialite now! Byyyyye!”

Who: Adebisi Shank (@adebisishank)
Why?: Humorous tweets from the Dublin frenetic rock trio taking in occasional reports from tours in Japan.
Sample Tweet: “Anyone get the Mr Tayto book? Was he really molested by the Monster Munch Cyclops?”

Who: John Mayer (@johncmayer)
Why?: Despite his music having less appeal than emptying the contents of a 40-year old bedpan over yourself, Mr .Mayer’s tweets are self-aware, tongue-in-cheek and thoroughly without the ego of a pop star.
Sample Tweet: “Sitting in a restroom stall. There is a man in the stall beside me. We’re both waiting for the other to leave. Entering minute 12.”

Who: Katy Perry (@katyperry)
Why?: Love her or hate her, Perry is the definition of spunky. She has 1.4 million followers and generally uses that power to post pictures of herself, her nails and giant ice cream sundaes.
Sample Tweet: “Dear driver, u think u just got away with a silent vomitous FART in the car BUT unbeknownst to u I just put u on blast on my twitter. Booya.”

Who: Calvin Harris (@calvinharris)
Why?: Famous for throwing tantrums on Twitter and generally being quite engaging, Harris most recently broke the news that he was in fact the stage invader on X-Factor last week.
Sample Tweet: “Was just thrown out of X-Factor for jumping onstage during Jedward with a pineapple on my head..”

Have any suggestions for who to follow – let us know @dayandnightmag

Layar, which is the first major application to be released which uses this functionality (as AR is really a clever combination of existing data and media) was launched this month for smartphones like the iPhone and Google Android. Start up Layar on your phone and it sets your location. You can then use it to search for the nearest bars, restaurants, public transport, Daft.ie listings, Google Maps, hotels and even the nearest people on Twitter (if they’ve set their location).

The results are overlayed over the phone’s camera output depending on where you point it. It works wonderfully and is an incredibly useful tool. If it becomes popular though, watch out for the increase of street phone theft due to people standing around static with their arms outstretched offering their phone to the world.

AR has already seen some genuinely innovative uses in entertainment too. Games are probably the first medium to pick up on AR with examples like Eyepet on the PS3 giving young gamers the opportunity to interact with a pet using a camera and their TV.

The technology is been innovatively used to promote the upcoming TV series The Vampire Diaries in the US. Passers-by a large screen on a busy city street see their image and in a play on the accepted myth that vampires don’t have reflections, they’ll see themselves disappear while other people remain in the background.

Music is getting left behind. A few months ago, Digital covered Julian Perretta’s innovative webcam-assisted music video and now John Mayer has become the first major artist to produce an augmented reality 3D music video. The video (which you can see a clip of – http://max.adobe.com/johnmayer/) is pretty dull, showing Mayer sitting around his living room, looking pensive but should please his legion of dull fans as they can move the camera around mini-John as they watch. It just goes to show that even cool technology needs some imagination to make it worth experiencing.