Last month, Deloitte released its annual Football Money League, which revealed the mind-bending revenues of Europe's richest clubs.
Among the revelations was Manchester United's return to the top of the list — its £515.3 million income last year made it the first club in history to surpass half a billion pounds in turnover.
Today, thanks to the ubiquity of social media, it's incredibly important for sports clubs to engage with fans across all the major platforms.
Some teams are better at this than others. Scroll down to see which clubs scored on social media.
20. Zenit St Petersburg — 2.1 million followers

Followers (millions):
Instagram: 0.3
Facebook: 1
Twitter: 0.8
Zenit St Petersberg is the first and only non-European club to make the list. The comparatively low international popularity of the Russian Premier League combined with Russian language social media accounts limits its overall following.
19. West Ham — 3.3 million followers

Followers (millions):
Instagram: 0.3
Facebook: 2
Twitter: 1
West Ham's small Instagram following will suffer from the loss of Dimitri Payet, who has about five times the number of followers as his ex-club. Nevertheless, their acquisition of the Olympic Stadium (now London Stadium) will see numbers of spectators increase, which should bump their social numbers.
18. Schalke — 3.7 million followers

Followers (millions):
Instagram: 0.3
Facebook: 2.9
Twitter: 0.5
The "04" stands for when the Club was founded... in 1904. With that much history you can bet the team has built up a huge fanbase, and much of that has migrated online.
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