We've always assumed those "Hot 21yr Old Looking for NSA fun" ads on Craigslist's Casual Encounters were all spammers and prostitutes. Turns out they may also be unwitting Long Island moms who have fallen afoul of a vindictive, and Internet-savvy, rival.

Police arrested a Hauppage, N.Y., mother last week after a falling-out between two 9-year-old girls culminated in the mother of one of the children allegedly creating a Craigslist "sex wanted" posting and directing respondents to call the mom of the other girl.

How times have changed. When we were at elementary school, our parents would just write the phone number of our classmates' mothers on the wall in truck-stop bathrooms.