The move comes after Liverpool FC’s Ryan Babel was fined last month for comments posted on Twitter.
Babel was forced to pay £10,000 for publishing a mocked-up picture of Howard Webb, the referee, in a Manchester United shirt on the site.
Babel is the first footballer to be fined for a comment made on social networking sites, while Arsenal’s Jack Wilshere escaped further action last week for complaining about referees on Twitter.
The FA, in a statement, said people should be aware that comments made on social networking sites would "be considered public comment," and that "comments which are deemed improper, bring the game into disrepute, or are threatening, abusive, indecent or insulting, may lead to disciplinary action".
The statement continued: "Comments which are personal in nature or could be construed as offensive, use foul language or contain direct or indirect threats aimed at other participants, are likely to be considered improper."
Earlier this month, the aimed at encouraging more adults in England to play regular football.
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