Two Issaquah girls accused of hacking into a classmate’s Facebook page and posting lewd messages were charged Monday with cyberstalking and first-degree computer trespassing.

The investigation of the 11- and 12-year olds began after the alleged victim’s mother called Issaquah Police March 18 and took her story to broadcast media. The Reporter does not name juveniles charged with crimes.

Prosecutors allege the girls used the victim’s Facebook account to send out messages offering sex to boys at school and to post lewd “updates,” according to charging papers.

The suspects also allegedly posted offensive photos on her page, including one of the victim with horns graffitied on her head.

Once the victim’s mother discovered what had happened to her daughter’s Facebook page, she believed it was the suspects because they had reportedly bullied her daughter in the past.

The mother confronted the girls, who allegedly admitted to her accusations.

Police believe the girls got access to the Facebook account, after the login was saved to one of their computers.

The girls later gave written statements to police.

The case shows the dark side of social media sites, said Dan Satterberg, the King County prosecutor, in a press release. “Many kids think that on a social media site that their actions will be anonymous and that they are free to use it as weapon to bully, harass and intimidate another person.”

If convicted, both of the girls could face up to 30 days in juvenile detention.

The 11-year-old must first go through a capacity hearing, to see if she knew what she was doing was wrong. Washington state law presumes children ages 8 to 11 aren’t capable of committing crimes.

The 12-year is scheduled to be arraigned May 10 at Juvenile Court. The 11-year-old could also be in court that morning, depending on the results of her hearing May 3.