$100 bounty for someone to suggest a social media handle for our project, Stack (www.stack.so)  – a go-to service for onchain point systems and leaderboards! 

Our current handle on X is @StackSocieties, but we've noticed people often refer to us by that name instead of Stack.

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@stackdotso. Prev CTO/cofounder of mirror. strangechances

Can you do some play on XP. Most people know XP in games:

Stack_xp
StackXP
XP_stack

Alternatively you could look for alternate spellings of stack that evoke gamification, games, play, or players.

Stackers 
Stackify
Stackz 
Stackerz

Finally chain inspired variations:

Stackoin 
Stacken
Stackit