John Dickson, 27, confronted 20-year-old Carl Gregory in a shopping centre car park in Broadstairs, Kent.
During the scuffle, Dickson, who had denied murder, placed Mr Gregory in a choke hold which ultimately caused his death.
Dickson was convicted after a trial at Maidstone Crown Court.
After the hearing, police said a friend of Mr Gregory's had fallen out with him over a social media post and she asked another man to speak to him about it.
He arranged to meet Mr Gregory at the shopping centre and took Dickson with him, and a fight led to Dickson becoming involved and placing Mr Gregory in a choke hold, officers said.
Police said Mr Gregory was also kicked while he was on the ground on 4 October last year.
Workers leaving nearby shops found his body, but he was declared dead at the scene.
The cause of death was later recorded as compression of the neck.
Det Sgt Ross Gurden said Dickson, of Northdown Road, Cliftonville, had gone out of his way to confront Mr Gregory.
He said: "I hope this case reinforces the message that the use of violence to resolve issues can result in life-changing consequences. Dickson is a young man who will now serve a considerable length of time behind bars."
Another defendant, Christopher Pollard, 20, of Brimstone Hill, Meopham, had faced the same charge and was found not guilty.
Sentencing was adjourned to Thursday.
At the time of his death, relatives described Mr Gregory as a typical 20 year old who enjoyed gaming, modern technology and Pokemon Go.
Early reports incorrectly linked his death to the Nintendo mobile game.

But his pro-Western party is set to win 41% of the votes, short of the majority he wanted to ensure a push to join Nato and the EU.
Mr Djukanovic had presented the vote as a choice between the West or becoming a "Russian colony".
Earlier, authorities said 20 Serbian paramilitaries had been arrested.
Prosecutors said the group may have been planning to kidnap Mr Djukanovic, who has been in charge for a quarter of a century.
The development, hours before voting took place, was described by opposition Democratic Front leader Andrija Mandic as "gross propaganda" and Serbia's prime minister, Aleksandar Vucic, said the timing was strange.
Serbia's former special forces commander, Bratislav Dikic, who was removed from the post in 2013 because of alleged criminal activities, was reported to be among those arrested.
The men had been charged with terror offences and one Serb was still on the run, Montenegro's police chief said.
Montenegro: Nato's newest and last member?
Montenegro country profile
Mr Djukanovic will now try to form a majority with smaller parties, and told supporters as the results came through that "tonight we can say that Montenegro will continue its path towards a secure place in Europe".
Montenegro would formally join Nato in months and step up talks on joining the EU, he said.
The Democratic Front Alliance, made up of largely pro-Serbian and pro-Russian groups, is forecast to win just over 20% of the votes. It also hopes to form a coalition among other opposition parties. Another, more moderate, opposition grouping stands at about 11%.
Many Montenegrins are unhappy that Mr Djukanovic is taking the country into Nato.
They remain angry that Nato bombed Serbia and Montenegro in 1999 as part of a strategy to halt the killing and expulsion of ethnic Albanians in Serbia's then southern province of Kosovo.
The opposition accuses Mr Djukanovic of corruption and cronyism, which he denies. He accuses them of receiving funding from Moscow, which they deny.
Montenegro, which has a population of some 630,000, has in recent years seen an influx of Russian money, homebuyers and tourists since splitting from Serbia in 2006.
A man who choked a video game fan to death during a fight over a social media post has been found guilty of murder.
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Montenegro Prime Minister Milo Djukanovic has declared victory in elections and pledged to push for closer ties to Nato and the EU.