Roberta's Pizza posted a picture of a user named Plantwaves (Nicol Leddington) who was brewing hops at a placed called Long Island Beer Project.

Here are some more of Plantwaves posts (the guy from the photo). Enjoy the subtlety:

• Legalize Cannibalism: https://www.instagram.com/p/BBsv3BgC39W/?taken-by=plantwaves
• Book of Black Magic: https://www.instagram.com/p/sAxrkDC3-l/?taken-by=plantwaves
• 666 Art Project: https://www.instagram.com/p/pg2gmJC39p/?taken-by=plantwaves
• Conjuring Demons Spell: https://www.instagram.com/p/BPlRtK7Dyyd/?taken-by=plantwaves
• Saturdays Are Made For Lost Boys: https://www.instagram.com/p/BUYe1tsgd3i/?taken-by=plantwaves

I don't think these people are worth spending too much time on -- seem more like wanna be satanists -- but there IS a lot of 666/satanic commentary and lot more on cannibalism throughout these posts and the people who liked them/commented. Lots of "pizza on pizza" consumption, which I think to them is a message about cannibalism?

Either way, I've seen Roberta's before on lists of strange pizza joints -- was in Wikileaks and Clinton attended a birthday party here once. Here is an old thread from Voat: https://voat.co/v/pizzagate/1446975