Something to consider regarding all those "good luck" posts which are followed by a string of comments declaring that "this one works!"
Statistically, for any given post with enough circulation, plenty of people will experience some kind of good luck shortly after seeing it. Plenty of people will also experience some kind of bad luck shortly after seeing it. Or a mix. Or nothing particularly good or bad. There are a lot of people with all sorts of things happening to them.
Out of those people, I strongly suspect that the people who experienced good luck are vastly more likely to remember the post, attribute a connection to it, and go find the post again and reblog it. Confirmation bias. However, even if people who experienced bad luck also reblog it to say "lol nope, didn't work," people who want good luck aren't going to reblog that version! So the one which says "this one works" is the one which gets reblogged, and the cycle repeats a few times until you've got a whole thread saying so, but the causality is backwards. The thread propagates when good things happen and doesn't propagate when they don't, and accumulates claims that it caused the good things. No special power is necessary, it's just a natural consequence of a lot of people seeing the post, having stuff happen to them, and reacting accordingly.
It's kinda like evolution, actually.
