I just did The Compassion Express: Even Rainbows Need Rain. It told me to find a song, image, or artwork and post the link to my wall. I did that and thought it would be cool to scroll back through in future and revisit the image as a mood booster. Unfortunately though the link isn't clickable -- worse yet, I can't even long press to copy the URL so I can paste it in my browser. So that was pretty disappointing! :/
All in all though, terrific app. I'm enjoying the positivity and have even gotten my kids on board with playing it. :)