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Since the 1990 s , it has increasingly diversified from the operating system market and has made a number of corporate acquisitions , their largest being the acquisition of LinkedIn for $ 26.2 " billion in December 2016 , followed by their acquisition of Skype Technologies for $ 8.5 " billion in May 2011 .
 LinkedIn, Skype Technologies
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 LinkedIn, Skype Technologies