This was the quarter when Facebook left behind memories of its troubled IPO last year: As it reassured investors that it has a strategy to sell ads on mobile platforms, its shares closed Q3 at $50.23 — a 101.9% gain since the end of June. That’s the biggest jump on the list of media company stocks we track. The sector did well as the economy, and advertising, improved: The Dow Jones U.S. Media Index rose 8.3% beating the Dow Jones Industrial Average (+1.5%) and Standard & Poor’s 500 (+4.7%). Radio company Cumulus Media came in second in our group, rising 56%, followed by Netflix (+46.5%), Best Buy (+37.2%), Pandora (+36.6%), and Yahoo (+32%). Among Big Media companies, Viacom (+22.9%) saw the biggest improvement followed by Time Warner (13.8%), CBS (+12.9%), Comcast (+8.1%), Disney (+2.1%) and Sony (+1.7%). We left Fox and News Corp off the list for this quarter; their stocks were essentially brand new after Rupert Murdoch’s company split in two at the end of June. Companies that probably were glad to see the quarter end include 3D technology company RealD (-49.6%), Barnes & Noble (-19%), Rovi (-16.1%), and Outerwall — the parent of DVD rental kiosk owner Redbox — which was -14.7%.