Recently every investor I talked to didn't like products that are built on top of Twitter, and I wonder if YC's perspective has also changed.
Twitter, and specifically the API team, has worked hard to come up with guidance for where they think there are opportunities in the ecosystem.
They have very clearly told third-party developers to stop making Twitter clients [1]. Twitter wants to own the display of tweets since they are focused on making advertising their core business.
But there are definitely opportunities if you think beyond just making clients. The five main categories that Twitter specifically mentions are: Analytics, Curation, Content, Publishing, and Enterprise [2].
To echo PG, there are definitely still big companies to be built on top of Twitter. You just have to think big to begin with.
[1] https://groups.google.com/forum/#!topic/twitter-development-...
This Twitter app is really something I wish I have. I have also seen other companies using Twitter in the context described in my application. I had even posted this idea on Facebook so that someone else could build it, but until now, it doesn't exist yet.
Please check out our application and let me know what you think.
Hard to tell, but that's probably a good indicator that they still are interested in them.