[3] Bartlett has frequently written about online extremism,[4] free speech,[5] and social media trends in Wikipedia,[6] Twitter,[7] and Facebook.

[8] In 2013, he covered the rise of Beppe Grillo's Five Star Movement in Italy for Demos, chronicling the new political force's emergence and use of social media.

The book discusses the darknet and dark web in broad terms, describing a range of underground and emergent subcultures, including social media racists, camgirls, self-harm communities, darknet drug markets, crypto-anarchists, and transhumanists.

[10] In 2017, Bartlett published his second book Radicals Chasing Utopia, which covered fringe political movements including transhumanism, psychedelic societies, and anarcho-capitalism.

"[15] In 2019, he co-wrote and presented the BBC podcast series The Missing Cryptoqueen, which investigated the disappearance of Ruja Ignatova, founder of the fake cryptocurrency OneCoin.