I doubt any of the Slobbering Body members actually have accounts on here but some of their underlings obviously do. I remember a few years ago when someone posted a link to the new Elders' Manual on here. I believe Simon got a notice from someone that it was to be taken down immediately (maybe Simon can confirm this?) due to copyright infringement.
While I doubt they spend hours and hours on here, Crooklyn almost certainly has a few of their henchmen who come on here to see what we know (usually before the R&F do) and probably with regards to any lawsuits or reports in the media about Witness pedophiles. They probably report back to the powers that be that we more or less make mincemeat out of their crazy doctrines, while the GB can only sit there in impotent rage that we're not living in the Good Ol' Days of ancient Israel where they could have all us 'apostates' murdered.