Have you noticed that SharePoint doesn’t offer an ability to easily search for people from a mobile device?
Although Office 365 offers an optimized UX for mobile devices, have you noticed that it doesn't offer the ability to search for information?
Building solutions with Office Graph
SharePoint 2013 does great job configuring things for you in search-driven publishing scenarios but there are a few things you should keep in mind to save yourself trouble.
With the recent release of Office Delve and Office Graph I decided to change my session and present about leveraging Office Graph for building custom solutions.