This is a great investigation you are doing @Gneo. In your longer post, though, you documented all your images using imgur. You should know that site is owned by Reddit, who is censoring pizzagate and will probably remove what you have saved there. Here's a recent post with some other options.

Also, it is likely that they are using "pizza exorcism" in the sense of wanting to cleanse Comet Pizza of the "hurtful fake news" driven by evil citizen investigators like us. :-)