When building Office Graph queries pass the name of your app in the ClientType parameter.
Using Delve is a great way of discovering new content. Even though it shows you content you might have not known about, everything you see, you can see because you are allowed to.
I have been re-awarded as Microsoft SharePoint Server MVP for 2015.
Recently, during my Office Graph presentation at the SharePoint Connect Amsterdam, I mentioned a few hidden gems in the Office Graph API. Those capabilities have just been included in the official Graph Query Language documentation on MSDN.
Building solutions with Office Graph