Having confirmed in-game advertisements for RMT* sites, we have taken the following actions to address this issue.
*RMT (Real Money Trade) is selling account or game data with actual currency in the real world.

Period: Aug. 24, 2013 to Sep. 5, 2013
-Accounts receiving disciplinary action for RMT advertisement: 518 Accounts -Action Details: Permanent ban from FINAL FANTASY XIV

In addition to chat filters, we will continue to address RMT activity through cooperation with our GM teams and STF (Special Task Force). If you are solicited by an RMT company in-game, please do not respond.

Among the accounts banned during our investigation, we have confirmed that many of these accounts were hacked. In order to protect your information, we please ask that you protect your Square Enix Account information. We also strongly recommend using the Square Enix Security Token to increase account protection.
For more information about the Security Token: http://sqex.to/o8p

When you see an RMT advertisement, please file a report by using the in-game command [System Menu] -> [Support Desk] -> [Contact Us] -> [Report Cheating].

*What is a STF (Special Task Force)
STF is a special team that eliminates any cheats or actions that would have a negative impact on FINAL FANTASY XIV, and aim for the safety of the community and maintain the play environment. More specifically, they control issues related to RMT or use of outside programs that are not part of the GM's control. Information gathered and confirmed in game by the GMs will be analyzed by the STF and will be applied to the countermeasures against cheats and RMT actions.