Its simple really, someone posts a challenge, someone else completes it then posts a challenge of their own.RULESSo, lets say the challenge was your bike in front of a mexican restaurant. You would ride around and find a suitable place to meet the challenge, then take a pic with your bike in the pic.Now that I have completed that challenge, I can suggest another one.Also, it would be nice if you used pics taken after the challenge was suggested, not something you just happened to already have a pic of. And try and keep the challenges reasonable.