The war of words began on September 14, when the US embassy in Kabul was attacked.
Before the attack, "NATO officials had kept close tabs on the messages posted on two accounts linked to the Taliban’s media arm," The Post reported.
"But [they] had refrained from engaging or acknowledging them."
Read more form GlobalPost: In shift, Taliban embrace new media
However, after militants threw rockets and shot gunfire at the embassy, US military officials assigned to the International Security Assistance Force (ISAF) took their opinions to Twitter.
To which Abdulqahar Balkhi, a "mouthpiece" for the Taliban, rebutted: “I dnt knw. U hve bn pttng them n ‘harm’s way’ fr da pst 10 years. Razd whole vilgs n markts. n stil hv da nrve to tlk bout ‘harm’s way.’”
Now an almost daily war has opened up between the two organizations—all within 140 characters or less.
To get an idea of their influence, the Taliban's tweets are read by about 9,000 people. The ISAF, on the other hand, has about 18,000 followers.
Navy Lieutenant Commander Brian Badura told The Washington Post that the ISAF's Twitter account used to be a tool to "regurgitate the company line."
But it seems those days are over since Twitter is the sole "open line of communication" between the US government and the Taliban.
"US military officials say... they needed to seize the propaganda initiative," The Post reported.
"In Twitter, they had a tool at hand that could shape the narrative much more quickly than news releases or responses to individual queries."
Read more form GlobalPost: Tweeting with the Taliban