Excerpt from a big-picture Facebook perspective
With the new enhancements for its “custom” Open Graph, Facebook will now be wiring its Web to capture every page, every user action, and, eventually, every significant detail — all recorded and categorized.
Unlike previous notable attempts to predict, or even define, a “semantic” Web — a Web where actions and objects are identified, categorized, and have meaning — I believe that Facebook’s will succeed. At first, however, it will do this one action and object at a time, gradually adding each one into its ever-expanding repertoire.
For its semantic approach, Facebook has two incredible advantages: it knows the people of the Web intimately; and, unlike any other system in the world, it records a true timeline of activity.