I send Thank You cards, write a note related to the service we provided. I thank them for 1) CHOOSING US and 2) TRUSTING US. Both of those are the key reason we're all still in business. I had two rubber stamps made, one in blue in saying "Review us on Google, Southard Tire and Auto". The other rubber stamp in red reads "Review us on Yelp, Southard Tire and Auto". I stamp both of these somewhere on the inside of the card and include our business card. My Yelp's are good, Google isn't so good as it seems to be tricky to do for some reason. I am also a TireRack.com installer, I REALLY encourage my customers to leave reviews there, the ones on there have driven A LOT of new business my way, for tire installs, alignments and many other mechanical repairs and services. I get a lot of thoughtful responses because of these cards. Highly recommend it!!