Clan Campbell

I was adopted as an infant and a few years back located my birthmother. She was a Campbell from Georgia, USA. All I know is that her father's name was Charles Campbell. The family are all tight lipped to me. Will not communicate in anyway with me. I would just like to get to know other Campbell's and hopefully figure out just where my heritage comes from. I've never had a heritage before and finding out that I'm Scottish means everything to me.
Any thoughts or information i'd appreciated it. Thank you!