Junction City Police and the Boyle County Sheriff's Office arrested a man because of his Facebook account.
33-year-old Derek Todd Neiderer was registered as a sex offender after he was convicted of sex crimes with a 13-year-old in Minnesota.
Because of that, he's not allowed to use any social network that allows access to minors, but investigators say they discovered he had a Facebook account and began to search for him.
They took him into custody Thursday, August 15th and put him in the Boyle County Jail.
If you have any information about a sex offender you think may not be in compliance with the law, call police.