Vitrue's Social Media Index (SMI) assigns brands and products a score based on overall buzz from status updates, videos, photos and blog posts. The company has tallied its results for 2009 and released its top 100 social brands based on index scoring, with last year's winner — the iPhone — reigning supreme once again.

Although the index focuses on consumer mentions and reactions — as opposed to indexing brand engagement via social media — the list is still a veritable powerhouse of information in terms of consumer buzz and word-of-mouth recommendations.

So who tops the list? iPhone, Disney, CNN, MTV, NBA, iTunes, Wii, Apple, Xbox and Nike rounded out the top 10 in 2009, respectively.

We also learn from Vitrue's blog post on the list that Adidas was the biggest gainer, jumping up from the number 85 slot in 2008 to take over the number 14 spot in 2009. NBA, Nike, MLB, Nissan, Victoria's Secret, HP and KFC also showed significant improvement from the previous year.

Some other interesting findings from Vitrue include:

- Game consoles dominate the top of the list: (Wii #7, Xbox#9, PlayStation #13, Nintendo #21) - Luxury brands appear on the list this year with good representation: (Gucci #27, Louis Vuitton #81, Prada #88 and Burberry #94) - Media brands make up 8 percent of list: (CNN #3, MTV #4, ESPN #23, CBS #32, ABC #33, Turner #36, Fox News #56, NBC #68) This perhaps illustrates our socialization of their content

Vitrue's Top 100 social brands for 2009: