Question: Where is the person from, who has written for acts such as Fifth Harmony, and a group that was originally YouTube celebrities?

Context articles: YouTube Live
5 Seconds of Summer
Britt Burton
Ammo (musician)
Fifth Harmony (album)
The Worst Kept Secret Tour
Fifth Harmony discography
List of YouTubers
Fifth Harmony
YouTube Rewind

YouTube Live was a 2008 event streamed live on the Internet from San Francisco and Tokyo.
 It was launched November 22–23, 2008.
 It was hosted by a variety of YouTube celebrities, including The Black Eyed Peas rapper will.i.am, Tom Dickson of Will It Blend, Michael Buckley, The Happy Tree Friends, Fred, Smosh, Esmée Denters and singer Katy Perry, among others.
 On April 8, 2011, The channel was closed, effectively removing all videos.
 It was replaced by the YouTube live section page.
5 Seconds of Summer is an Australian rock band that formed in 2011.
 The group were originally YouTube celebrities, posting videos of themselves covering songs from various artists during 2011 and early 2012.
 They rose to international fame while touring with One Direction on their Take Me Home Tour.
Britt Burton is an American singer and songwriter from Columbus, OH.
 Her songwriting credits include Jessie J "Masterpiece", Noah Cyrus "Stay Together" and Alexandra Burke “Elephant.”
 She has also written for acts such as Fifth Harmony, 5 Seconds of Summer, The Saturdays, The Chainsmokers, and The Wanted.
Ammo (born Joshua Coleman) is an American record producer and songwriter.
 Ammo has co-written and produced songs for Beyoncé, Kesha, Katy Perry, Pitbull, Maroon 5, Britney Spears, Jessie J, Jason Derulo, Mike Posner, Fifth Harmony, R. Kelly, Flo Rida, and Selena Gomez.
 Ammo has contributed to hits such as Maroon 5's "Sugar", Katy Perry's "E.T.", and Fifth Harmony's "Work from Home".
Fifth Harmony is the self-titled third studio album by American girl group Fifth Harmony, released on August 25, 2017, through Syco Music and Epic Records.
 Its lead single, "Down", which features rapper Gucci Mane, was released on June 2, 2017.
 It is the group's first album following the departure of Camila Cabello in December 2016.
The Worst Kept Secret Tour is the second official tour from American girl-group Fifth Harmony and the third overall.
 The tour began in Ventura, California on February 2, 2014 and ended on March 24, 2014 in Buffalo, New York.
 The group performed in this tour around the same time when they were opening acts for Demi Lovato's 'Neon Lights Tour'.
 The official poster for this tour was chosen by Fifth Harmony among many nominations submitted by fans.
 The tour was planned as an early tour for fans who were going to see the group in Demi Lovato's 'Neon Light's Tour'.
The discography of American girl group Fifth Harmony consists of three studio albums, six extended plays, ten singles and thirteen music videos.
 After finishing third on the second season of the American televised singing competition "The X Factor" the group was signed to Epic Records though Syco Music.
 Less than a year later, Fifth Harmony released their debut single from their debut extended play, "Miss Movin' On".
 The single charted on the Mainstream Top 40 and New Zealand, peaking at 27 in both countries.
 It was certified gold in the United States for selling combined sales and track-equivalent streams units of 500,000.
 The group's extended play, "Better Together" peaked at number six on the "Billboard" 200 and number 18 in New Zealand, charting in both countries similar to the group's lead single.
 As part of the promotion for "Better Together", four other versions were released of the extended play, including an acoustic release, a Spanish-language acoustic and a standard Spanish-language translated version as well as a remix edition.
YouTubers, sometimes called YouTube personalities or YouTube celebrities, are a class of Internet celebrity and videographers who have gained popularity from their videos on the video-sharing website, YouTube.
 Some YouTube personalities have corporate sponsors who pay for product placement in their clips or production of online ads.
 Networks sometimes support YouTube celebrities.
Fifth Harmony is an American girl group based in Miami, composed of Ally Brooke, Normani Kordei, Dinah Jane, Lauren Jauregui, and previously Camila Cabello until her departure from the group on December 18, 2016.
 The group signed a joint record deal with Simon Cowell's label Syco Records and L.A. Reid's label Epic Records after forming and finishing third in the second season of the American televised singing competition "The X Factor" in 2012.
 Rising to stardom by social media, the group's debut extended play, "Better Together" and their three studio albums, "Reflection," "7/27," and "Fifth Harmony" all charted within the top ten of the "Billboard" 200 in the United States.
YouTube Rewind is a video series produced and created by YouTube and Portal A Interactive.
 These videos are an overview and recap of each year's viral videos, events, memes, and music.
 Each year, the number of YouTube celebrities featured in the video, as well as the presentation of the series, have increased.
 The latest episode of "YouTube Rewind" was released on December 8, 2016.