I'm being charged with stalking, something I did not do.?

The story is pretty complexed, but I'll try to explain the matter to the best of my capability. I'm nineteen years old and just got out of a relationship with a seventeen year old girl of almost two years. Around last April or so, she's had a cyber stalker. This person took over her Facebook account and email address, began to post horribly embarrassing and sexually explicit content on her Facebook page, sent out her cell phone number to people she did not even know, and has pretty much ruined her reputation completely. For some odd reason, her parents assume it has been me. Now, I have had no motive or desire to cause so much harm to a person I dated and loved dearly for a year and nine months. A week ago, the police came to by door with a warrant for my arrest for stalking. It was completely random and out of my element since me and this girl haven't formally communicated since the beginning of January. When I got to the Fulton County jail, that's when they laid down all of the facts. I spent two days in that hell hole and was lucky enough to post bail for $5,000. Tomorrow I'm having my pre-trail hearing at 9am to hopefully get this case dismissed. This girl's family is very wealthy and her father apparently has ties to the Johns Creek Police. I honestly don't even know how they were able to arrest me in the first place with out some kind of proof or probable cause. In all honesty, I'm scared shitless. I'm a black teenager who was dating a wealthy, white underage girl. Her family has been trying to keep us apart since the beginning and I feel like they may just be using this as an opportunity to succeed in that. They day I was released from jail her father filed a temporary restraining order against me. The document itself was ridiculous. He claimed that she is in fear for her life and the well being of her immediate family. I have done nothing for them to feel that way. Since summer, the girl kept our relationship a secret from her parents and we were on and off for a little while, but basically always together. I just need some encouragement, insight, whatever someone could tell to reassure me that things will be justified and okay. I can not go back to jail, I have way too much to look forward to as young as my life is, including college in the fall.