Brown and his dog Gracie have been snapped tweeting while on "business", with Gracie's account saying "I get to go to work with dad, I get to bif all his visitors and sit in his lap all day".
On Gracie's bio, she is described as a "baby yorkie on a DiploDog Mission to NZ".
Haley's staff also help service her Twitter account, including tasks such as taking photos that are disseminated to her more than 770,000 followers, Buzzfeed reported.
But according to the US Foreign Affairs Manual, the use of a personal Twitter account for business purposes, and the use of a gag Twitter account, are forbidden.
"Senior officials and other employees whose positions make it appropriate for them to engage in official communications on behalf of the Department over social media ... must not use personal social media accounts to do so," according to the rule book. "They must use official social media accounts, created and owned by the Department."
The rules, pushed through in January, are designed to prevent political appointees from exploiting public office by using their official title to build a massive social media presence before exiting their roles.
But who is the administration's most high profile violater?
Mr President Donald Trump himself.
Trump himself continues to use his personal account, @RealDonaldTrump, for official purposes, including communicating with foreign leaders and discussing government policy on social media.
It remains to be seen if State Department bureaucrats will impose the rules on Haley or Brown given Trump's own prolific violations.
Or maybe, just maybe, they'll have the guts to impose a ban on Trump himself.