It is by far the deadliest feud in Ireland this year, claiming the lives of five men who were shot dead in cold blood and only garda interventions preventing many more murders.
The Coolock feud is a very modern gang dispute and social media has proved the perfect weapon to spread hatred and fear.
Online threats, tributes and videos have all played a part in fuelling the out-of-control vendetta which centres on the drugs trade.
The use of social media started with the feud's first murder, that of Zach Parker (23) who was shot dead at Applewood, in Swords, on January 17.
Some of the slain drug dealer's closest associates used platforms such as Instagram to show their loyalty to Parker at his funeral.
In one photo posted online, notorious Finglas drug dealer 'Mr Flashy' posed with two suspected hitmen while at the funeral floral tributes to Parker were displayed with logos of fashion labels such as Louis Vuitton and Alexander McQueen.
One was shaped in the form of a Rolex watch, with a working clock as a centrepiece.
Also present and active on social media later that day was another young drugs trafficker Sean Little (22), who was making a big name for himself on the northside's crime scene.
"These are the new breed of young dealers - some of them would not even have been born when John Gilligan's gang murdered Veronica Guerin back in 1996," a source told the Herald at the time.
"These are young men who like the finer things in life - designer clothes, expensive cars and beautiful women. Some of them are making huge money from drugs trafficking."
However, a grim fate was in store for Little as he was lured to Walshestown Road, Balbriggan, where he was murdered late on the night of May 21 when he was blasted multiple times in the head.
An exact motive for the murders of Little and Parker has never been established but gardai believe they were most likely killed over a drugs debt that they could not or would not pay.
Just 17 hours after Little was murdered, his drug-dealing pal Jordan Davis (22) was killed after being shot several times as he walked his four-month-old baby in a pram in Darndale. A man has been charged in relation to his murder.
Ten minutes before he was shot, Davis had posted a tribute to his pal Little on Facebook. In the post he wrote "Rest in paradise you wer a gent" along with a picture of both Little and Parker and a third man.
A sick taunt was also left by an anonymous account underneath the tribute which read: "Your resting with him hahahahaha." It was quickly deleted.
It is understood that close associates of Little blamed another active Coolock criminal called Eoin Boylan (22) for this post and gardai believe that this may have played a significant part in the murder of Boylan who became the feud's fifth victim when he was shot dead on the night of November 24.
In the aftermath of the murder the Herald revealed that associates of Little took "grave offence" to a comment that Boylan posted on social media following their pal's killing.
In the six months between Little and Boylan being shot dead, Boylan survived numerous attempts on his life as the feud threatened to spiral out of control.
And in tandem with the murders, multiple garda arrests and violent incidents, social media continued to play its part in keeping the war going.
In late June, WhatsApp messages were distributed which showed letters that had been sent to Little's family. One letter seen by the Herald contains the words "the maggots are eating scumbag Sean".
Among the vicious taunts in the letter were jibes including: "He is no loss, good riddance to the drug pusher. What about the families he destroyed to make money".
Little was also labelled a "drug pushing little ba****d and a "scumbag" in the shocking letter.
By this stage, another associate of Little had been murdered - Iranian national Hamid Sanambar who was killed less than a week after Little.
He was gunned down in broad daylight outside the Little home where mourners had gathered to pay their respects.
Gardai are investigating whether Sanambar was murdered as revenge for luring Little to his death.
As the summer continued, social media activity increased and in one of the most bizarre developments, a major criminal who cannot be named for legal took a lie detector test which he said proved he wasn't involved in the killing of Little.
Chillingly, however, the gangster's efforts to prove his innocence were rebuffed by Little's associates who released a copy of the lie detector report on social media - alongside the picture which had been altered with the words: "You can send us all the lie detectors you want you dirty dog ... you're dead."
As the feud escalated, in November it emerged that gardai were investigating after a gangster, who was previously arrested over a foiled hit as part of the feud, posted a series of bizarre social media videos threatening his rivals.
He is part of the mob which has been targeting associates of Little as well as two notorious criminal brothers from Kilmore - one of whom is locked up.
In his shocking series of online rants, he made major threats against a 26-year-old rival who was attempting to procure bombs to target his rivals and his 33-year-old brother who claimed he had been staking out the younger rival.
In the strange online posts, he claimed he was driving around looking for the gangster and other named criminals and was parked outside houses at night.
He claimed that he had €1,000 in cash and was videoed waving around a wad of €50 notes for people who had information about his rivals' whereabouts or information about the cars they were using.
He also threatened to rape a young man who he claimed called him making threats who has connections to the brothers he is feuding with.
In the videos, he bizarrely referred to his rivals as "wet the beds" as he laughed hysterically in increasingly erratic clips.
"Anyone who gives them respect should hang themselves - they wouldn't kick snow off a rope," the convicted criminal proclaimed at one stage.