Craigslist
ThoughtStorms Wiki
Local, classified's site.
Now big enough to be a threat to local newspapers and EBay :
According to Nielsen / Net****Ratings's data, its traffic is now about a fifth of eBay's. And the operational efficiencies are astounding: Craigslist has 18 employees; eBay has 8,800.
Only puts people in touch. Doesn't do trust and payment etc. However, because it's local, maybe its a kind of SituatedSoftware so doesn't need.
(Discussed on IndieHackers)
See also :
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