Many have suspected that John Perry Barlow was mentioned by Q because of his internet project: https://www.eff.org/cyberspace-independence. This of course, makes sense. Just read the first few paragraphs and it'll make sense to you too. I, on the other hand, think its because of the words he wrote for the grateful dead. JPB wrote these lyrics during a time when words to songs weren't taken at face value. He was a poet and a storyteller and he was able to use words that could describe the past by talking about the present. JPB knew what was happening and he is describing it in lyrics .

https://www.dead.net/song/estimated-prophet https://www.dead.net/song/throwing-stones

JPB is mentioned a couple of times by Q.