Instagram, made up of the words "instant camera" and "telegram," is an online mobile photo- and video-sharing and social networking service.
It enables users to share pictures on a variety of social networking services, such as Facebook (NASDAQ: FB), Twitter, Tumblr and Flickr. Created by Kevin Systrom and Mike Krieger, it was launched in October 2010 and now has more than 150 million active users. Facebook purchased the app for billion in 2012.
Many celebrities have profiles on Instagram, which they use for sharing photos and videos of their personal and professional lives with fans.
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So exactly who has the most followers?
Kendall Jenner - 1,913 posts and 12,051,566 followers
Kendall Nicole Jenner is an American television personality and model best known for appearing on the E! reality show Keeping Up with the Kardashians.
She celebrated reaching 10 million followers by posting a twerking video of herself in a French hotel and has recently been voted Teen.com’s best celebrity Instagramer.
Selena Gomez - 586 posts and 12,444,074 followers
The 22-year-old actress and singer has had an on and off relationship with Justin Bieber and is known for using her Instagram account for cryptic messages; fans try and work out if the relationship with Bieber is on or off.
Ariana Grande - 1,568 posts and 13,735,840 followers
Her full name is Ariana Grande-Butera, and she is an American singer/songwriter and actress whose parents are of Italian descent.
Known as the new Mariah Carey because of her vocal range, she has sung at the White House for Barack and Michelle Obama. She recently used her account to slam a fan for a homophobic comment about her brother Frankie, a constenst on CBS' Big Brother.
Kim Kardashian - 1,860 posts and 17,069,249 followers
The American television and social media personality, socialite, fashion designer, businesswoman, model and actress knows how to grab attention.
As part of the infamous Kardashian family, she embodies its brand, as Keeping Up With The Kardashians was voted the Choice Reality TV Show this year, the show's ninth season in production.
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Justin Bieber - 1,684 posts and 19,507,518 followers
The Canadian singer/songwriter has received numerous industry awards, including both Artist of the Year American Music Awards. He was nominated for Best New Artist and Best Pop Vocal Album at the 53rd Grammy Awards.
Bieber was named by Forbes magazine in 2012 as the third-most powerful celebrity in the world, although last year fell to number nine.
Bieber's first arrest in January 2014, coupled with a string of controversial incidents during 2013, has led to his demise as a "boy next door" celebrity.
An expert in social media, he has more than 40 million Twitter followers, and much of his success and appeal stems from his use of YouTube. He is one of the few to have received a Klout score of 100.
The pop star's Instagram profile box reads "Help change the world. Pray 4 me and idolize Jesus."
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