Jamaica have won gold in the men's 4x100 metres relay in a world record time of 36.84 seconds.
Usain Bolt anchored the Jamaican team to gold and even seemed to pay his own tribute to Farah, performing the Briton's 'Mobot' celebration as he crossed the line after powering away from American Ryan Bailey on the final leg.
The US team finished second and Canada thought they had claimed bronze but were disqualified after Jared Connaughton ran outside his lane on the third leg, leaving Trinidad and Tobago to finish third.
Bolt was asked if he could do the 'treble-treble' by winning the 100m, 200m and 4x100m again in four years' time, having achieved the feat first in Beijing and now in London.
He is not convinced it is possible.
Bolt said on BBC1: "I've thought about it but I think it's going to be very hard because Yohan, he's just come into the game and he's running pretty well, and I'm sure there's going to be a lot more cats coming up to run.
"I'm just happy. I'll take it a step at a time."
Asked whether he would run more often in Britain if tax laws change - a factor in him having stayed away in the past - Bolt said: "As soon as the law changes I'll be here all the time.
"I love being here, I have so many Jamaican fans here and it's wonderful."