West Ham's Danny Gabbidon has been fined by the Football Association following comments posted on his Twitter account.
The Wales international has also been warned as to his future conduct.
The 31-year-old was charged with improper conduct in April after delivering a foul-mouthed message to Hammers followers.
Disgruntled in the wake of a 2-1 defeat to Aston Villa, the centre-half hit out at critical supporters on Twitter.
Gabbidon, who has since closed his account, wrote: "U know what, f*** the lot of you, u will never get another tweet from me again, you just don't get it do you. Bye bye."
The FA confirmed on Tuesday that Gabbidon had accepted the charge levelled against him.
A statement released by the governing body of English football read: "At an Independent Regulatory Commission, West Ham United defender Danny Gabbidon was fined and warned as to his future conduct.
"Gabbidon was charged with improper conduct in relation to media comments made on the social network media site Twitter on 16 April 2011.
"Having admitted the charge, Gabbidon was fined £6,000."
Gabbidon becomes the second West Ham player to be sanctioned regarding their use of Twitter this season.
Striker Carlton Cole was charged with improper conduct and fined £20,000 for comments he made in the wake of England's international friendly against Ghana.