Source:
Product Hunt Launch Guide
Facebook Groups
https://www.facebook.com/groups/ProductHuntBerlin
https://www.facebook.com/groups/612366049190855
https://www.facebook.com/groups/producthuntupvoters
https://www.facebook.com/groups/producthuntupvotes
https://www.facebook.com/groups/producthunt.exchange
https://www.facebook.com/groups/producthuntexchangecommunity
https://www.facebook.com/groups/producthuntupvote
https://www.facebook.com/groups/producthuntgermany/
https://www.facebook.com/groups/388232458714072/
Slack Groups
product-school.slack.com
indieworldwide.slack.com
startupstudygroup.slack.com
launch-chat.slack.com
growthhackertalk.slack.com
programmaticmarketing.slack.com
makers-kitchen.slack.com
pigeonhack.slack.com