Uber is offering Uber riders a chance at free Uber credit worth 5€ in Germany. The process is as simple as spotting an uberTAXI on the streets of Berlin, Frankfurt, or Munich. Once you have seen the Uber car, just take a picture and share it on Twitter with the hashtag #uberTAXI. This activates the promo and gives you free Uber credit. All current and new Uber account riders who share their photos within the next 2 weeks get 5€ free Uber credit!