Take the same precautions online as you would offline.
Meet in a place like a coffee shop, restaurant, bank or shopping center. Avoid meeting in secluded places or meeting in your home.
When buying or selling items that are of high value take extra precautions. If possible always take someone you trust with you.
Be sure to have your cell phone with you when meeting someone, and always tell a family member or friend your meeting location.
Available Online safety resources and information from various government sources.