So coming from the email marketing industry where people in the same industry are hard to come by, we used skype groups to communicate and get fast replies to questions vs waiting ages. It was a really helpful resource so I decided to start a skype group for people that sell on Amazon.
This is not taking anything away from reddit as this is more long winded questions, etc. I obviously use both.
More Amazon selling tips at the Wix site
Amazon Research Guide 