STOP. THINK. VERIFY.
STOP - Watch out for a sense of urgency. Scammers want this deal done NOW so they can ride off with your money. They want to strike fast before you've had any time to think it through carefully.
THINK - Avoid those too-good-to-be-true offers. Sure, this should be common sense but so many people get hooked. Scammers rely on the open and trusting nature of this community as well as the attraction to rare bottles at good prices. Legitimate businesses run sales, but if a deal is hard to believe, you need to take a second look.
VERIFY - Some profile clicks. A quick 10 second search of replies and mentions. That's all it takes sometimes to research an account before getting sucked in to a scam. The speed of social media has people out of the habit of investigating before spending. Watch your money.