Nothing is 100% safe. I worry about IP logging and a federal agency sniffing IPs as they log into the site. The fact that you are behind a firewall means nothing. Your outgoing IP address is determined by your ISP. They can trace that IP back to you if asked. It is definitely something that worries me and has kept me from posting images. I'm tempted but I just don't feel comfortable. That said, I am on here a lot giving and receiving advice. That in itself could be sufficient for unwanted attention.