Before we proceed further, a note about the level of access we can gain with the Facebook API--you will only be able to gain information about the user who is logged in. The specific user's friend list is inaccessible through Facebook's API, but a small subset of friends who have also installed the same app is available. Since it's not very useful in our project, I'm purposefully omitting it.
While the user's posts and photos will certainly have a list of comments along with the names and pictures of the people who posted them, accessing those friends' profiles is not possible using the current iteration of the Facebook API.