Need somebody to eat with? Give Marc Horowitz a call. The San Francisco-based artist is on a national roadtrip to meet people who saw his number in a Crate and Barrel ad and dialed him up. He was working on a photo shoot when he decided the dry-erase board in the ad looked too blank -- so he wrote his cell phone number on it. Thousands of people saw it and called. Many hung up, some rambled on and others invited him over for dinner -- everything from lasagna in Georgia to chicken and dumplings in Alabama. Horowitz plans on criss-crossing the nation for at least a year -- saying human contact is about old-fashioned "face to face" time, not just email.