This is the URL of the Superfeedr PubSubhubbub hub. This hub can only be accessed by Superfeedr users.
PubSubHubbub is an open protocol for distributed Publish/Subscribe communication on the internet.
The main purpose is to provide near-instant notifications of change updates in feeds, whether they are RSS or Atom. Superfeedr will always find the best way to identify updates in a feed and will them to your application, so you don't have to poll.
Read this PubSubhubbub introduction if you want to get started.
We also host several hubs for many services. If you're looking for specific feeds from these services, you may want to check them :
Superfeedr