With two-thirds of the US internet population expected to belong to a social network by the end of 2013, according to eMarketer estimates, the majority of brands are now actively using social media to manage their digital presence.

Q3 2012 findings from media buying and solutions provider STRATA showed 91.9% of those surveyed were using social media. The vast majority (82.4%) of US agencies reported using Facebook for clients’ social media campaigns, nearly double or more the number using the popular platforms YouTube (41.9%), Twitter (36.5%) and LinkedIn (23%).

via Marketing Interest in Pinterest, Google+ Climbs – eMarketer.