The NYPD is telling its officers to clean up their act on the Internet.
An internal order made public on Thursday advises members of the police department to "demonstrate professionalism" when using Facebook, Twitter and other social media.
It warns that sharing personal information and opinions has the potential to put them in danger and undermine their credibility.
The same order urges officers to not even mention they're members of the force. And it bars them from posting photos of themselves in uniform.
The directive comes after the son of the FDNY commissioner, an EMT, quit the department when he was discovered to have posted offensive messages on Twitter.