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Tried to illustrate flow of site without text, so primarily with images. Visual breadcrumbs help understand where they are in the process.
Used pictures of children to illustration aggregation by person.
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This was designed for a smart phone screen. It makes heavy use of dates to aggregate data. The default screen shows recently captured content. To find the specific picture from the birthday, knowing the day of the birthday, the User can search for a specific date, scroll through the pictures and see if they are there. Clicking on a picture will copy the link. This can be shared through text or email.
Learnability
The outlines of the tabs clearly demarcate what mode the user is in. Text boxes are labeled and links and buttons should have the proper affordances to indicate their uses.
Efficiency
The efficiency of this interface stems mostly from the anticipation of user needs. The "Recent" tab provides immediate access to more current content which is presumably used more. Also, the buttons to email or copy or the pictures link are located next to the picture themselves as tasks commonly following viewing a picture or video.
Unfortunately, if many pictures occur on the same day, the user would potentially have to scroll through all of them if searching for something in particular. While this is better than simply searching through all pictures, it is something to improve in future iterations.