Imagine a feed view of people you follow [or everyone] that displays auctions by you, auctions by friends, stuff you just bought (that you submit into this system, rather than it pulling for you like Blippy was doing), and stuff you have for sale (links to your ebay or craigslist listings, or just a message of something you have for sale).
Some of this could be automated (I think), if the user inputs their eBay username, maybe their auctions could be auto-included (if the user allows that).
Revenue would come from various affiliate links/programs to these eBay auction listings, Amazon.com product listings, etc.
(this idea is from November 20, 2007, but is being shared with you today)
I’m going through the past few years of ideas that are in my moleskine notebooks. Some of the ideas are really lacking, but might give you an idea? All of these ideas are yours for the taking. Don’t forget my archive of 100+ web startup ideas.