<p>This file combo image made from photos provided by the Etowah County Sheriff's Department shows Joyce Hardin Garrard, 46, left, and Jessica Mae Hardin, 27. Garrard and Hardin are charged with murder in the death of 9-year-old Savannah Hardin. Experts say the hundreds of messages posted online since Savannah died in February show the legal system has yet to catch up with the social media explosion. They say it highlights the difficulty of making sure witnesses and ju…

May 7, 2012