Another reason to watch who you are "Friends" with on Facebook...

A Washington woman inadvertently discovered that her husband had a second wife, when an automated Facebook pop up suggested that the two women become "friends" on the social media network.

According to the Associated Press, the husband in question is Alan L. O'Neill, a 41-year-old corrections officer in Pierce County, Wash. O'Neill reportedly got married to his first wife in 2001, and then in 2009 separated from her, moving out but not formally divorcing or filing for legal separation.

He allegedly then asked his wife to keep quiet about the two marriages, which are a crime under both state and federal laws, promising that he would rectify the situation. Instead, O’Neill’s first wife, who has not been identified in police reports, went to law enforcement authorities with the news. In March of last year, O’Neill was charged with bigamy and placed on administrative leave. If convicted, he faces up to a year in prison.