1 in 8 online ads in America is socially enabled

"The link between digital advertising and social media is becoming all the stronger, too. 1 in 8 web ads are now socially-enabled, meaning they direct consumers to social media destinations, e.g. by asking for a Facebook ‘like’ or Twitter ‘follow’. The most socially-enabled advertising area lies in consumer goods, with almost 1 in 5 of all adverts displaying such characteristics. Indeed, consumer goods take a 22% share of the socially-enabled advertising share."
Source:  Data from comScore, reported by We Are Social, 28th February 2013
Note - I'm sot sure whether this includes ads on Facebook or Twitter, for example...  Clearly 100% of those are socially enabled...