If you are not interested in certain people contacting you, you should have the option for filtering in your free online dating service. Most of the services have a filtering option and these can really come in handy when you are trying to keep some people away from you. If, for example, you are not interested in people who are young enough to be your child, you can filter these people out. The internet dating site should be a pleasant experience for you and you should not have to talk to anyone with whom you do not want to communicate.