For example:
bbc.com/news thewashingtonpost.com huffingtonpost.com reuters.com cnn.com theglobeandmail.com theguardian.com en.wikipedia.org
Go to any of those as a start and submit one of the articles you find and everything suggested by @gist was generated by an algorithm.
Our hope is that will help get the ball rolling. We are certainly very subject to network effects, so focusing on a niche and providing tremendous value to that one vertical is a good strategy.