Joe Sugg and Caspar Lee are two guys in their 20s who share a flat together in London. They are also members of an exclusive group of YouTube superstars breaking through into Britain's mainstream media.
Last week, it was announced that Lee and Sugg will guest-host a Radio 1 show on Sunday evenings, along with other online personalities.
So let's take a look at the two men changing the way presenters are being discovered in the UK.
This is Joe Sugg.
View this video on YouTube
He apparently used to work as a thatcher, and has named his YouTube channel ThatcherJoe in tribute.
He is the younger brother of fellow YouTube star Zoe Sugg, who goes by the name Zoella.
Sugg told BuzzFeed he remains puzzled as to why his videos have received so much attention.
This is his first ever YouTube video, posted on 7 August 2012.
View this video on YouTube
His ease on camera is obvious, as is his winning combination of goofiness and natural humour.
His impressions have also contributed to his success online, as seen in the first video above.
His fifth video involved his sister. It has so far been watched 2.6 million times.
Her channel focuses on lifestyle advice, but she also regularly pops up in videos by her brother, as well as her boyfriend – fellow YouTube star Alfie Deyes, aka PointlessBlog – and other members of the UK YouTube scene.
Within a year of his first video going live, Sugg was travelling the world creating more and more elaborate videos. Here he is flying to Los Angeles to spend time with Simon Cowell.
View this video on YouTube
Within 15 months, he had accumulated over 1 million subscribers.
And last year, in September, he appeared on Radio 1 DJ Scott Mills' show to take part in a game of Innuendo Bingo.
The invitation came after he developed his own riff on the game, YouTuber Innuendo Bingo.
To top off a remarkable rise to fame, he has now been signed up by Sky 1 to present an online show to accompany Got to Dance.
Sometimes I look back at what's happened over the last two years and just think F**ck I'm a lucky boy.
This is Caspar Lee.
His video with porn star Asa Akira, for example, sees Lee playing the immature clown while creating content clearly aimed at an older audience.
View this video on YouTube
He appears willing to broach topics his squeaky-clean roommate wouldn't.
And that can attract controversy.
In a video from January 2012, he "jokingly" contemplates and acts out methods of suicide.
View this video on YouTube
He says in the video: "If you know somebody who has committed suicide, I’m sorry, I don’t mean to offend you. I needed to contemplate this topic the way I wanted to contemplate it, and if you don’t agree with the way I contemplate things then you’re a control freak because it’s my head."
His one-line disclaimer of "please don't take this video seriously" did little to stop the backlash in the comments section.
However, perhaps as a sign of maturity, two years later he was doing videos on the dangers of addiction.
Lee seems happy to share every element of his life with his viewers, and in January introduced them to his girlfriend, Gaby.
View this video on YouTube
Six months later though, in arguably his most personal video to date, "Pros and Cons of being a YouTuber", Lee revealed there were some significant downsides to being an internet star.
"Yeah, as I said earlier I needed to tell you something that happened in my life that wasn’t great recently," he said in an almost confessional way. "Me and my girlfriend Gaby have decided to separate."
However, he maintains the pros dramatically outweigh the cons.
He revealed to BuzzFeed: "Yes, some days the pressure doesn’t feel great and a negative comment might stick in your head, but on the whole I’m usually very happy about my situation.
"I don’t regret exposing myself to my viewers. I’m not ashamed of anything that I’ve exposed, and think about what I say before I say it."
As such he remains hugely relatable to his young fans, and is about to hit 3 million subscribers on YouTube.
While it all appears fun and natural, there's a serious business side to all this. Sugg and Lee are signed to the Gleam Futures talent agency, which represents almost all the major UK YouTube stars.
Like pop stars and actors on social media, they have millions of teenage fans hanging off their every tweet and picture.
Their fans' commitment borders on obsession.
@Caspar_Lee please follow me it would make me the happiest girl in the world 22
@Joe_Sugg Hi Joe, I just want to say thank you for making me laugh every single day :* Your videos are the best videos! Love you ♥♥ :* xx.
Hats off to Zoe and Joe Sugg for being two of the most attractive siblings I've ever seen
hey @Joe_Sugg i'm just here tirelessly waiting for you and @Caspar_Lee to notice me...........
@Caspar_Lee hey caspar heres a pizza please follow me #casparlovespizza
I'm in love with @Joe_Sugg
PLEASE NOTICE ME @Joe_Sugg @Caspar_Lee
@Caspar_Lee love you Casper ❤️
I fucking love casper lee
@Caspar_Lee CASPER!! U are sooooooo CUTE!!! #cutenessoverload xx ☺️
when @Joe_Sugg walked out on Got To Dance yesterday when I was in the audience I screamed so hard and now my throat hurtsly millions joe
Can we all just have a moment to talk about how well @Joe_Sugg has done with his presenting the past few days-I'm so bloody proud
And this success appears to be just the beginning for Sugg, Lee, and other young online personalities working in Britain.
