Local markets benefit from fragmentation
ownlocal.com
ownlocal.com
The small town vendor story is instructive:
Walmart destroys downtowns, but it also saves the (oftentimes poor) locals hundreds or thousands of dollars a year. In some communities, this has been a huge boon to standards of living, even though it closed the local hardware shop. In other towns, it has turned them into a wasteland of low wage jobs in strip-malls and broken a big chunk of the local economy.
The same question can be put to the web markets: Going with one or two big providers will almost certainly add to efficiency gains, and thus lower prices. Is trading away the competition worth it?
Edit: Sometimes equilibria is two or three providers, or one dominant and a few smaller (think search). In my mind the best case market is probably US coffee, where you have one dominating chain (Starbucks) that opens up the market for lots of smaller one-offs.
Facebook tends to be a closed circle. Patch has been plagued by both abusive, anonymous commenters and astroturf. Yelp seems focused on reviews and not on giving people their own voice and creativity. Groupon shows hardly any community interaction.
We still don't see many well-known sites that come close to offering the authentic experience of living in a mostly caring and helpful town with myriad subject matter experts. Some of these sites are more like the lunatics running the asylum. It's the same problem the editorial page has had for ages-- it acts like flypaper! The business model that can afford to carefully curate so much hyperlocal content really does not exist yet, so we find ourselves settling for something less until then.