There was a topic back there that died.What you do is,one person posts a picture.Then you post another picture,but it can't have anything to do with the last.
Example of the right way to do it:
Person 1 posts a pic of a cat
Person 2 posts a pic of a banana
Example of wrong way to do it:
Person one posts a pic of a dog
Person 2 posts a pic of another dog
I'll start: