There are several, here on plcs.net.
One of the main ones is Phil Melore, the plcs.net main man. He started plcs.net.
Others, have put up sites pertaining to other related fields.
Many operate their own business, some work for someone else. Check the number of posts that some members have, over several hundred, specially those over a 1000 or more, then they are definitely some kind of revolutionary.
However... I get the feeling that this isn't related to Programmable Logic Controllers, then you have the wrong PLC and revolutionaries in mind.
Best Wishes in either case.
regards.....casey
PS: TOM, Exactly!