It comes after she faced the wrath of Mariah Carey fans when she said the star "constantly disses people".
Demi did post some messages before leaving the social media site though - asking why people always focused on the bad and not the good, like the work she does with her mental health charity.
On Monday Demi posted a series of Twitter messages expressing her dismay at Internet trolls and announced that from that point forward she would only be using Snapchat, an app which doesn't have a comments function - writing 'I like Snapchat cause I don't have to see what some of y'all say. Follow me if you want: theddlovato'
Demi has 36 million followers on Twitter and nearly 41 million on Instagram.