The joy and despair of the moment was shared in real-time on Twitter, with a peak of 49,000 Tweets per minute (TPM) when City were confirmed as champions at 1650 BST.
His team-mates soon got in on the act.
And rock star @NoelGallagher landed the ultimate fan souvenir, Kompany’s captain’s armband.
The mood just up the road in Liverpool was more measured as @LFC fell just short in their bid to end a 24-year title drought.
And, in the weeks building up to the finale, Liverpool had taken a lead in the Twitter conversation, attracting 123,000 Tweets behind captain Steven Gerrard’s rallying cry #WeGoAgain.
@ChelseaFC and @Arsenal filled the remaining Champions League spots and look set to continue their see-saw rivalry to be the most followed UK team on Twitter. Arsenal retain a slender advantage with 3.78 million followers, compared to 3.76 million for Chelsea.
But both gave up ground to @ManUtd, who added 2.41 million followers in their first season on Twitter.
Breaking big news exclusively first on Twitter was their recipe for success, with news of Juan Mata’s (@juanmata8) arrival at the club being retweeted 49,000 times and news of Moyes’s departure 79,000 times.
BREAKING: Manchester United announces that David Moyes has left the club. (part 1 of 2) #mufc— Manchester United ( @ManUtd) April 22, 2014
Twitter continues to bring football fans closer to the action and the stars than ever before.
Never was this more apparent than for a game between West Ham United and Hull City.
More than half of Premier League players are on Twitter, including eight of the @PFA team of the year: Luke Shaw (@LukeShaw3), Vincent Kompany (@VincentKompany), Gary Cahill (@GaryJCahill), Seamus Coleman (@seamiecoleman23), Eden Hazard (@hazardeden10), Yaya Toure (@Toure_yaya42), Luis Suarez (@luis16suarez) and Daniel Sturridge (@D_Sturridge).
When lifelong Toffees fan @ric_wee travelled from Malaysia to watch a game at Goodison Park for the first time, he had his hopes dashed by a freak winter storm and a postponement.
Instead of going home disappointed, Martinez and Leighton Baines, who had been made aware of Wee’s plight via Twitter, invited him down to the player’s area for a special meeting.
Meanwhile, @SouthamptonFC, revelling in one their most successful seasons, repaid fans by using the #TwitterMirror (which takes selfies at exclusive events around the world) to publish behind-the-scenes photos at their end-of-season awards and from the tunnel at their last home game against @ManUtd.
England full-back @LukeShaw3 led the way in this Vine video.
And then everyone got involved.
But its players and fans will be back #Together on Twitter soon enough, when season 2014/15 starts up and promoted Leicester City (@OfficialFoxes) Burnley (@BurnleyOfficial), plus one of Derby County (@dcfcofficial), QPR (@OfficialQPR) and Wigan Athletic (@LaticsOfficial) will emerge victorious from the play-offs.
On 16 August, #WeGoAgain.