The goal of Facebook is to connect users better. Clarified goals
Segmented users based on age and developed personas: young, working professionals and a retired elder
Tried to list the pain points of each segment like connectivity, sharing current life with friends, need to talk to friends, etc.
Prioritized pain points common to all segments as home screen is to be developed
Listed solutions to solve the pain points like: Messaging feature, Posting feature, customized UI for elder users
Prioritized solutions based on cost and value