http://www.facebook.com/carfax - For those of you who want to invest in used cars you may want to get some help from Carfax. This is especially true if you are looking to buy a used car for the first time, Car fax folks will tell you that information you need can be found at carfax.com. Carfax will make sure that you get all the information you need so you can decide if the used car is best for you.