@SimGuruNinja Probably the most well known guru that comes here and adds input in threads and responses to players. (Pretty sure he lurks here on the forums as a ninja usually does.) >3>
And I believe @SimGuruGraham and @SimGuruFrost maybe? Either way, it's easier to use twitter among anything to relay anything to simguru since it is convenient and fast among with guru's that handle things like bugs. Also they stay active at the AHQ with bug reports as well and always asking for people's save to be uploaded to something like cloud so they can better pinpoint bugs they haven't seen or been able to recreate.
Course not seeing Simguru's constantly active here doesn't always mean they aren't aware of discussions and feedback here.