Social Media now reaches the majority of Americans 12+, with 52% having a profile on one or more social networks. This figure is driven largely by Facebook, which is now used by over half (51%) of Americans 12+. Twitter is as familiar to Americans as Facebook (with 92% and 93% familiarity, respectively); however, Twitter usage stands at 8% of Americans 12+. Approximately 46 million Americans 12+ now check their social media sites and services several times every day. Much of this frequent usage is driven by mobile access. 56% of frequent social network users own smartphones, and 64% of frequent social networkers have used a mobile phone to update their status on one or more social networks. Location-based sites and services (such as Foursquare and Facebook Places) are familiar to 30% of Americans 12+, and used by 4% of Americans 12+. One in four social network users knowingly follow brands, products or services on social networks. For those who use these sites and services several times per day, this figure increases to 43%.

You can see the full study below, but it's clear there is an audience using social media that your business or organization should be communicating with.