But it is innocent, just read it! It doesn't try to influence anyone, it doesn't name anyone, it is harmless.
In answer to how I would feel, I have shared the Facebook post which says something along the lines of: If you see a post from me saying their, when it should be there send help, I have been kidnapped! I wouldn't expect anyone to believe I had posted anything out of character because none of my friends would believe it! As someone said up thread, he probably wishes he had said it.
Maybe you should read it again and then you will see it is a simple bit of harmless fun!