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VIRTUAL COMMUNITIES (Mobile Apps (Apps tools/resources (ai-bee-logo,…

- - - - 2004: blogs used as political networking tool
        2008: all major candidates using blogs
- - - - Charging both buyers and sellers to participate
      - Selling advertising
    - - Bring together geographically dispersed people sharing narrow interests
- - - - Descending-price auctions
      - Sealed-bid auctions
      - First-price sealed-bid auctions
      - Second-price sealed-bid auctions
      - Open-outcry double auctions
      - Double auctions
        
        Reverse (seller-bid) auctions