Now there is a great new site that recently started a project that gives users a chance to share the information about a call they got from an unknown caller. If it was a sales call, a wrong number a crank call or some other unknown call, you can give the number and tell others about this call and you can look the number up to see if others have complained about the same phone call. Phone Lookup Investigator lets you search their entire directory and comments and get other information. You can also add numbers and information about unknown calls for others to see. Click the link above for more information.