Stocks to Watch Friday: LinkedIn, Activision By: MarketWatch February 09, 2012 at 17:18 PM EST LinkedIn, Activision Corp., PPL Corp. and Calpine Corp. are among the stocks that could be actively traded on Friday. Read More >> Related Stocks: Activision Blizzard Alliancebernstein Holding LP Alliant Energy Corp Buckeye Partners LP Laboratory Corp American Holdings PPL Corp