Ever since Facebook (META 0.14%) went public last year, investors and analysts have speculated about if and when it would find its way onto the S&P 500 (^GSPC 0.87%), the most widely tracked equity index in the world.

The answer came last Thursday with an announcement from the index committee that the time has come. Starting Dec. 20, the $130 billion company will officially be listed on the S&P 500. In the video below, Motley Fool contributor John Maxfield discusses other recent additions to the index and what it suggests about Facebook's chances for outperformance going forward.