Fighters of the Islamic State of Iraq and the Levant stand guard at a checkpoint in the northern Iraq city of Mosul. Picture taken June 11, 2014. REUTERS

As real bombs fall on Iraq, a Twitter battle rages between supporters of ISIS (the Islamic State of Iraq and Syria or just the Islamic State) and Americans, who are using the respective tags #AMessageFromISISToUS and #AMessageFromUSToISIS to pen threatening and demeaning messages in less than 140 characters, with lots of references to sex with goats.

The tag war broke out on Friday, with #AMessageFromISISToUS striking first with a tweet announcing the hashtag would be used to send warning messages to the United States. #AMessageFromUSToISIS was used just over an hour later. #AMessageFromISISToUS has been filled with photos of beheadings, photos of the 9/11 attacks and the ugly consequences of America’s wars in Iraq and Afghanistan.

This photo and a few others like it have gotten attention:

Opponents of ISIS have now taken to #AMessageFromISISToUS as well, posting their thoughts on radical Islam and the superiority of American and Western military in memes and photos. At the height of its use on Friday, #AMessageFromISISToUS was tweeted more than 35,000 times:

Here are a few tweets on the "classier" side of #AMessageFromUSToISIS:

A few users are taking the opportunity to air out their political stances as well: