From a study of more than 800,000 Facebook users and ads from 14 brands in a variety of categories:
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There is a marked increase in ad recall, awareness and purchase intent when home-page ads on the social network mention friends of users who’ve become fans of the brand in the ad.
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The impact on awareness and recall is even more pronounced when a home-page ad coincides with what Facebook and Nielsen term “organic” social advocacy, i.e. an item in a user’s news feed indicating a friend has become a fan of a brand.
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Facebook-home-page ads on average generated a 10% increase in ad recall, a 4% increase in brand awareness and a 2% increase in purchase intent among users who saw them compared with a control group with similar demographics or characteristics who didn’t.
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The increase in recall jumped to 16% when ads included mentions of friends who were brand fans, and 30% when the ads coincided with a similar mention in users’ news feeds. Brand awareness saw similar bumps: up 2% from just a home-page ad, 8% with a “social ad” bearing mentions of friends who were brand fans and up 13% when a home-page ad appeared along with a mention of friends who were brand fans in the users’ news feeds.
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Purchase intent was 2% higher among viewers of home-page ads vs. nonviewers, but got a four-times-bigger bump, up 8% either from social ads or when ads appeared alongside organic mentions of the brand in the news feed.
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Based on those numbers, it’s still a lot easier — if not necessarily cheaper — to buy scale on Facebook than earn it by winning fans. It’s also an indication to Mr. Gibbs that marketers need to focus on winning Facebook fans over the long haul if they want to improve their odds of success when advertising there.
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Of the 18 million users exposed to the ads, only around 130,000, or less than 1%, “engaged” with them by clicking on them. But around 40,000, or around 4%, of users who saw organic mentions of their friends become brand fans clicked on those news items.
From: http://adage.com/digital/article?article_id=143381