Your website or service is responsible for all the data it receives from your clients and customers. The responsible thing to do is to include a terms and condition content to your website or contact.
I am a computer science, legal geek heading to law school who had to research and assist a firm. A lawyer and I have READ and WRITTEN T&C for 7 difference industries and can customize one for your industry.
If you are in USA, UK or AU, do not ignore this! Protect yourself and your company from potential lawsuits.