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Their marketing was absolutely brilliant : Simply through association with Google , and because of the invitation - only membership , they created a product with instant cachet - - something so in demand invitations went for $ 50 on eBay , and one enterprising site even offered a kidney for an invite .
 Their, Google, they, eBay
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 Their, Google, they, eBay