TRIANGLE: A designer must be someone who understands the output from multiple perspectives; Twitter interface shortcoming: nearly impossible to go back and gather archival data; the design choices which made user turn to Facebook and Twitter for different activities.
SQUARE: The design decisions guided Facebook and Twitter to perform differently and thus, resulted in the way they are used.
CIRCLE: What would be a sad shortcoming of Facebook that hinder user experience in an equivalent way Twitter’s archival data access does?