It's interesting that Blizzard/Activision doesn't ever get labeled as a social gaming company, even though they've created three of the the best social games in the last 10 years with World of Warcraft, the Call of Duty franchise and Starcraft.
"Social game" is a bit of a misnomer and refers specifically to the mechanic of leveraging social networks to gain more users through explicit in-game benefits of doing so. It doesn't really have anything to do with "being social"; it's just iterated word misuse.
