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Two-thirds of marketers have used social media in 2009 and half have used viral videos, making these two formats the fastest-growing tactics in marketing, according to a survey from the Association of National Advertisers (ANA), BtoB Magazine and ‘mktg’.

The 66% who used social media this year represents a a increase over 2007 survey results, which revealed that only 20% of marketers were using social media and 25% were employing viral videos two years ago. Among marketers using social networking, the top sites being used:

- Facebook (74%)

- YouTube (65%)

- Twitter (63%)

- LinkedIn (60%)

via marketingcharts.com