We have an official Helldivers board within the PlayStation forums. Due to a recent PlayStation forum migration, there seems to be a few issues organising posts and content on there. It will hopefully become more organised and visited in the future when feature usability is back.
Join the Steam discussion boards and mingle with other Helldivers PC players. The boards are active and are visited by us regularly.
Stop by the Reddit community and say hi. We discuss all things Helldivers related and both PC and PlayStation users are welcome!
You can search for our community run Discord server called "Helldivers™ Official" where you can chat to other players and find games to join. We often have a few developers hanging out on the server as well.