I remember those, i think they were in the appendix of The Dilbert Principal. I thought the gravity one was particularly strange. I bet he had one of those perfect storm personalities that just go completely crazy when hooked into a sufficiently large social media network.

btw, affirmations is a pretty common thing in a lot of religions and other superstitions. Every single Catholic mass is pretty much just the same affirmations/mantra/rituals over and over with a bible story at the end. They even publish the schedule on an annual basis iirc. (my wife briefly converted to Catholicism when we were getting married)