It's the digital equivalent of waving at someone from across a crowded room. And yet a Tennessee woman was arrested last month for "poking" another user on Facebook.

According to an affidavit filed with the Sumner County General Sessions Court on Sept. 25, Shannon D. Jackson of Hendersonville, Tenn., allegedly violated a legal order of protection that had been previously filed against her when she sent a virtual "poke" to another woman on Facebook.

The Facebook poke feature can be used to convey a variety of meanings, including simply saying "hi" to friends, according to Facebook. When you poke someone, an alert pops up in the corner of that person's Facebook page notifying them of your poke.

Although Jackson declined to comment, her lawyer, Lawren Lassiter, told ABCNews.com that his client was "extremely shocked" when the police arrested her.

"The only evidence that I'm aware of is a printout of a screen," said Lassiter, adding that the printed screen grab of the victim's Facebook page is what led police to determine that the protective order had been breached. "I'm trying to get my hands on some Facebook documentation so we can better assess the situation."

Lassiter declined to comment on the events that led to the protective order against his client, but he said that violating an order of protection is a Class A misdemeanor that can be punished with up to 11 months, 29 days in jail. Jackson is scheduled to appear in court later this month.

The protective order against Jackson, filed on June 10, prohibited her from "telephoning, contacting or otherwise communicating with the petitioner, directly or indirectly," the affidavit said. The victim named in the affidavit, Dana M. Hannah, did not respond to requests for comment from ABCNews.com.