Google is also adding the ability to vote plus-one on search ads. Internal tests have shown that plus-one votes increase clicks; Google won’t charge for the functionality, but expects better ads to return more plus-ones and, in turn, more clicks. Higher click-through rates can improve quality scores, meaning marketers with better ads could pay less for a given keyword or position.
Google Adds Own ‘Like’ Button in Foray Into Social Search | Digital – Advertising Age
Google adding ’+1’ to advertising as well. Smart. Facebook does this, too, but in kind of an indirect way. Ads don’t have a ‘Like’ button on Facebook, but if your friend ‘likes’ the advertiser, then I think it says so.