But some legal experts suggested that Mr O'Brien overreached and that a conviction might not stand up on appeal.
Drew was not directly charged with causing Megan's death. They harassed Megan Meier.'Dean Steward, defending Drew, said his client had little to do with the content of the messages and was not at home when the final one was sent.
After the suicide, Missouri passed a law against cyber-harassment and similar federal legislation has been proposed on Capitol Hill.
During the week-long trial, the court heard Megan's mother, Tina, recount finding her daughter.
US prosecutors said Drew violated the My Space terms of service by conspiring with her young daughter and a business assistant to create a fictitious profile of a teenage boy on the social networking site to harass Megan.