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Definition 1 of 2
Pro Tip 1/3Empathy Signal
Indicates shared experience or feeling, often for commiseration. 
Had a tough day at work? Join the club!
Pro Tip 2/3Casual Tone
Used informally among friends or peers, not in formal discussions. 
You're feeling hungry already? Join the club!
Pro Tip 3/3Common Ground
Helps to quickly establish a shared connection or problem. 
You don't understand this math problem? Join the club, let's figure it out together.