Because Apigee is a tool used by people who build things on top of APIs, we get to see a lot of cool mashups and tools — Flickr Photosets is one of them, built using the Flickr and Facebook APIs proxied through Apigee.

It's easy to see why this app has so many fans. It's the fastest and most intuitive Flickr app we've seen on Facebook. You can also view and share your comments.  And it's an impressive example of how community can make an app better — with both open source code available for any facebook developer and a rich community discussion forum for users to suggest improvements.

Brad Dougherty, the app developer, uses Apigee to monitor usage, errors, and response time from the Flickr API. We appreciate Brad's great feedback such as making it easy to identify (and rate limit) different URLs by API method calls specified by parameters - we've heard that across a few users, and we are working on it. We asked Brad for his comments on working with Apigee and for what he's learned through this project.

Although my app hasn't had any downtime since I started using Apigee, it's a great way to monitor that calls to the Flickr API are actually working, something I haven't been able to see in the past. The biggest lesson I've learned from this app is that it can be very taxing to keep up with the changes in Facebook's API. It's a battle to keep adding new features when you keep having to change things to keep up-to-date with Facebook.