Another couple things:

- Make the subject and context of your email, "I could really use your advice". Ask these contacts for help and advice on what they would do in this situation. A guy at cars.com might know that they won't buy this site, but knows someone at XYZ that would be worth talking to.

- Use any and all networks/groups of folks you can think of at LinkedIn. E.g. Find people who went to your same school that work at cars.com. No matter if you have ever met them. Mention the alma mater. It helps.