Social media scatters your brain, and then you buy stuff you don’t need

Social media can be mentally draining. And when mentally drained, you are more likely to be influenced by a high number of likes on posts – even to the point of clicking on ads for products you don’t need or want – according to our recent experiments on how social media affects behavior.

As a professor of advertising, I have studied social media behavior for years. In late 2022, my colleague Eric Haley and I conducted three online studies on Americans aged 18-65 to test how people under various mental loads respond to ads differently.

The control group in each study was given no introductory task – we just had them look at an ad. A second group had to memorize a nine-digit number and then look at the ad. The third group scrolled through their Instagram feed for 30 seconds and then looked at the ad. The first study used an ad for a meal prep service, the second was for ice cream and the third was for coffee beans.

The ad photo and caption were the same for everyone in each group, with only the number of likes manipulated. Participants randomly saw an ad with a few hundred likes or tens of thousands of likes. After viewing the ad, each participant rated how willing they would be to buy the product, and how much mental effort it took to think about the information. The group that used Instagram first were the most likely to want to buy the featured product when there were lots of likes or comments, and they also reported using the most mental effort to assess the ad.

In one study we asked people to explain why they wanted to buy a product, and those in the control group gave simple, rational answers for their choice: “I was thinking of the ice cream flavors and how they would taste.” Or, “I like the ad. It is simple and clean. It gets straight to the point …”

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