Trying to find parking in San Francisco sometimes feels likes a car-based version of “Survivor.” It’s not pretty. Cars block driveways, drivers forget to curb their wheels, lights get left on, and meters run out. These are all reasons why you might want to contact a vehicle’s owner. If everyone in San Francisco signed up for CurbTXT, then it would be easy to get in touch. Drivers can sign up for CurbTXT by registering their license plates and phone numbers. A sticker on the car gives people an anonymous way to contact the driver through text messaging by referencing the plate number. The service forwards the message to the owner. CurbTXT is a sweet idea. It could turn San Francisco into a wonderland of parking good deeds, helping people avoid fines and giving them the opportunity to move their vehicles before they get towed.