She told them that her husband Donnie Stacy had hit her repeatedly with a gun after overhearing her on the phone with another man.
Stacy was not at the property when police arrived, but officers found him nearby. He was arrested and charged with assault.
They found the handgun he used to beat his wife under a tyre swing that the couple's son plays on, the Daily Mail reported.
Leslie County police believe the post may have saved Mrs Stacy's life.
Leslie County Sheriff's Deputy Sam Mullins, who responded to the incident, said when he arrived at the home that he knew immediately something was not right. "A lot of people depend on wifi. They have smartphones, computers.
"They do not have land lines but they do have internet," he said.
Mrs Stacy told local media she planned to file for an emergency protective order against her husband.
After her ordeal Mrs Stacy posted on Facebook. "A statement about the events of Monday. I posted a picture via wifi because it was my ONLY way to seek help. I didn't have a phone to call on ... no cell service ... just wifi. I just wanted help ... to not die in a pool of my own blood [on] my kitchen floor. I am thankful for all the help ... care ... concern ... and humanity shown to me. There are so many negative statements being made ... along with positive ones ... following the news stories. To each their own. Time to find that more better forever. Blessings."
