The Knockoff by Lucy Sykes and Jo Piazza (2015)

I love few things more than a dishy novel about the world of magazine publishing. It brings me back to my chick lit days! 

Imogen Tate returns from a medical leave of absence to her job as editor-in-chief at Glossy magazine, and her former assistant (Eve) is now running the social media arm of the magazine. Imogen doesn't know Twitter from Tumblr, so conflict and drama and delicious behind the scenes ensues. 

Pretty darn fun.