I need a pennsylvania attorney who specializes in internet law.

My non-profit corporation is being harrassed by a rogue Facebook page whose administrator has an axe to grind and constantly encourages nasty posts and ad hominem attacks on our volunteers and our non-profit events. She deletes any positive comments. [We run fund raising events to help bring greyhounds from the racetracks to foster homes and ultimately forever homes. We have a ten-year track record of philanthropy.]