The baby faced bomber, who was part of the trio who blew themselves up outside the Stade de France during the match between Germany and France on Friday night, posts photos alongside guns, piles of cash and sunbathing topless.
At just 20-years-old, Bilal Hadfi is suspected to have traveled to fight with ISIS in Syria, where he was known as 'Abu Moudjahid Al-Belgiki' and 'Bilal Al Mouhajir', according to Belgian terror expert Guy van Vlierden.
He left just a week after the Charlie Hebdo massacre, after warnings about his increasingly extreme and violent world view went unheeded.
A year later, he posted a chilling picture of a kalashnikov, seemingly taken with a mobile phone.
The profile, which has now been archived, dates back to 2011, with posts from 2013 referencing the 2007 riots - above the press photo of a group of hooded men stand a top a police car he writes 'F*** the police'.
It was in his final year of school when his interest in politics took him down the path that would eventually end outside the Stade de France.
Hadfi stopped listening to music, saying it was haram, or forbidden, and was vocal in his support for Boko Haram, the Nigerian Islamist terror group.
It was when he agreed with the Charlie Hebdo massacres which took place in January that his school teacher Sara Staccino really became worried, however.
'He said it was right what happened was because the magazine had insulted his religion,' she told Belgium's Radio One.
But her attempts to warn others and stage an intervention fell on deaf ears: a week later he left to join ISIS.
Hadfi, who was French of Moroccan origin living in Belgium, was just one of the three bombers who tried and failed to get into the football stadium.
According to The Wall Street Journal one of the attackers backed away from a security guard named Zouheir when frisked and then detonated his vest, which was loaded with explosives and bolts.
A second terrorist also blew himself up outside the stadium around three minutes later before a third suicide attacker detonated explosives at a nearby McDonald's.
Speaking to Vocativ Bellingcat’s founder Elliot Higgins, said that that Bellingcat had noticed similarities between a photograph of Hadfi that has been publicly released and images on the Facebook profile, and that Bellingcat had found links between the Facebook page and at least one family member of another attacker.
Higgins created the Bellingcat open source investigative project after becoming known for his open source reporting on the Syrian civil war identifying various rebel groups and most famously for his research into the 2013 chemical attacks.
By Isabel Hunter and Tom Wyke
