Question about Challenges:
Are you supposed to accept a Challenge then go do it OR are you allowed to accept a Challenge then post an old picture of you doing the activity in the past?
i.e. World Challenge - Be A Kid Again (To complete this challenge, you must take a picture of yourself climbing a tree.) - was posted only a few hours ago & already 100 people claim to have completed the Challenge. There is no way that all of these people could have completed the Challenge that quickly - plus many of the pictures have people climbing trees with specialty equipment, again not possible that quickly - and many even noted in their logs that it was a tree that they climbed in the past and an old picture.
If you can get credit for things done in the past, I can post a picture of myself doing tons of these Challenges in the past & rack up a bunch of smiles.