Flexible Survival

Is there a player vs player option in FS multiplayer? I know there's a challenge application at flexaplesurvival.com, but what about when you're actually in game?

Yes, but it is entirely opt-in and location based.

Where is the player vs player area? I had no idea there was PvP in Flexible Survival, then again I've only been playing since the end of last year. Also can you please take a look at my post and help me? Thank you again.