Sheffield United fans post the most positive tweets about their club, research has found.
Social scores network CrowdScores looked at the interaction of fans with their clubs' official Twitter accounts.
They compared how many followers each club's official Twitter account had against the number of mentions of that Twitter handle.
It also analysed the sentiment of each tweet, marking each as positive or negative.
Sheffield United fans posted nine times as many positive tweets about their club compared to negative ones.
QPR fans were found to be the most negative, with almost twice as many tweets about the London club deemed to be pessimistic rather than optimistic.
The study found Leeds fans the most vocal on Twitter out of all 92 English professional clubs.
Supporters of the Sky Bet Championship club came out on top in the study, averaging 7.7 tweets per fan over the last six months.
Fellow Championship side Middlesbrough were second in the study at 6.6 tweets per fan, while Everton were the leading Barclays Premier League club with 6.3 tweets, ahead of Arsenal on 4.7.
David Walker, CEO of CrowdScores, said: "When you combine Leeds United's rich heritage with the various goings-on during the last season, it may not seem too surprising that their fans are vocal on Twitter.
"But to see them top all 92 teams demonstrates just how passionate they are. Football fans are increasingly taking to social, forums and in-app discussions to praise and vent about their teams before, during and after the big matches. This is only set to increase and we look forward to the various debates in the upcoming season."