Within just a few weeks, Darren Osborne was transformed into a killer consumed by anti-Muslim venom.
In the weeks leading up to the 2017 attack, searches were carried out on three devices - an iPad and iPhone linked to Osborne's daughter, and an iPhone linked to his partner.
Here is a timeline showing relevant social media activity and internet history on these devices that was outlined to jurors by prosecutors:
May 16, 17, 18
Three episodes of the BBC drama Three Girls are aired.
Osborne's estranged partner tells the court in a statement that he became "obsessed" with Muslims after watching the programme, which made them both "angry".
She says it is possible the pair watched the episodes on catch-up at a later date.
Manchester terror attack.
Some 22 people die after Salman Abedi detonates a bomb at the end of an Ariana Grande concert at the Manchester Arena.
Osborne receives an email from Twitter inviting him to confirm his account.
7.15pm - Britain First deputy leader Jayda Fransen sends a direct message to Osborne on Twitter. The content of this message is not known.
Late evening - London Bridge terror attack. Eight people die in the knife and van atrocity.
12.48am-12.49am - A number of web searches for Jayda Fransen carried out on an iPad.
Views a number of tweets from her, including breaking news on London Bridge.
1.11pm-1.24pm - A number of Google searches for Britain First leader Paul Golding carried out on an iPad, followed by further searches for Jayda Fransen and Tommy Robinson, English Defence League founder.
Osborne receives an email welcoming him after joining Twitter.
10.36pm-10.38pm - Google searches for "syria bus bombing", "manchester bombing", "lee rigby" and "westminster bombing" carried out on an iPhone.
3.09pm-3.22pm - A number of Google searches for a variant of "muslim celebrating usis in tunnel" carried out on an iPhone.
Accesses Infowars article: "Proof: Muslims celebrated terror attack in London."
9.09pm - Google search for "which party want to bring back the death penalty" carried out on an iPhone.
6.21pm - Google search for "bad things about labour" carried out on an iPhone.
6.22pm - Google search for "mayor of rochdale" and "local MP of Rochdale" carried out on an iPhone.
6.34pm - Google search for "sadiq khan" carried out on an iPhone.
Screenshot of an image captured on an iPhone of an email, probably a circular, from "Tommy Robinson" to "Darren Osborne", inviting him to a rally in Manchester.
It says: "What Salman Abedi did is not the beginning and it won't be the end. There is a nation within a nation forming just beneath the surface of the UK. It is a nation built on hatred, on violence and on Islam."
The message is signed "Yours Truly, Tommy Robinson."
Early hours - Grenfell Tower fire. Some 71 people die in the London tower block blaze.
9.01am-10.23am - A number of Google searches for Tommy Robinson carried out on an iPad.
6.16pm - iPhone screenshot shows a second email from "Tommy Robinson" to "Darren Osborne" on seeking justice for Chelsey Wright, of Sunderland.
10.10am - Osborne rents a Citroen van from Pontyclun Van Hire in Mid Glamorgan, Wales.
1.23pm-1.30pm - More Google searches for Tommy Robinson carried out on an iPad.
A tweet by Tommy Robinson - "Anger? When a Muslim bombed our kids we were told not to look back in anger?" - is viewed.
1.35pm - Google search for "sadiq khan says part and parcel" is carried out on an iPad.
1.37pm - Google search for 'Jeremy Corbyn' is carried out on an iPad.
3.22pm-3.37pm - A number of Google searches for Tommy Robinson carried out on iPad.
3.31pm - A tweet by Tommy Robinson - "Where was the day of rage after the terrorist attacks. All I saw was lighting candles" - is viewed on an iPad.
3.37pm - Google search for "sadiq khan carry on as normal" is carried out on iPad.
7.30pm-9.30pm - Osborne goes to the Hollybush pub, where he composes a handwritten letter said to have been found in the van used in the attack and is accused of "preaching racial hatred" by another customer.
Osborne travels to London.
12.15am - Osborne drives van into a group of Muslims tending to a man who has fallen ill.