Girl Online by Zoe Sugg

Girl Online is the first novel by Zoe Sugg (Zoella), one of the most popular bloggers in the world. The novel follows the story of Penny, a 15-year-old girl who has been a successful blogger since the age of 11, but who also lives a rather ordinary life. When Penny starts writing an online diary and her blogs start to make a big impact, she finds herself living a double life.