This article originally appeared on The Conversation and has been republished with permission.

Facebook – the social network that started in a Harvard dorm room 15 years ago – has evolved into a media and advertising giant. It's helped create a new age of precise consumer insights. With over 2 billion users worldwide, Facebook can offer granular data about each and every one of them to advertisers – not just demographics but the very narrowly defined interests, conversations and interactions they have on the platform. Advertisers try to leverage all that information into online purchases by directly targeting consumers with messages meant to stand out as they scroll through a newsfeed.

As a media and advertising psychology scholar, I've been researching Facebook and its effects on persuasion for the past 12 years. Long gone are the days of brands offering consumers meticulously crafted messages with mass appeal that provide strong arguments or important cues to get them to change their attitudes and behaviours.

Facebook has driven an ongoing digital revolution within the advertising industry, redefining the persuasive process advertisers have traditionally known. Now people communicate differently on and because of Facebook and other social media services. And their buying behaviours have changed too.

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Facebook's not so social anymore

My collaborative research suggests that people's motivations for using Facebook have shifted over the years. People used to visit for online socialisation and interpersonal communication. But now their reasons are more passive, having to do with the desire to be entertained and the simple fact that checking Facebook is convenient.

Facebook users, for the most part, have moved from being hyperactive – endlessly posting about the ins and outs and ups and downs of their lives – to being, simply put, habitual lurkers.

There are two reasons. First, Facebook has reinvented itself repeatedly over the past 15 years with updates to its look and feel as well as functionality.

Second, users' perceptions of Facebook have changed. The size of a typical "friends" network has increased immensely. For many, the Facebook experience has shifted from simulating a high school reunion with a few handfuls of invitees to an outdoor rock concert with a huge audience.

The connection with one's strong ties – your close friends – still remains. But people are gravitating toward using Facebook to see what's out there, grab a smile or a laugh and then move on with their lives. Sure, there's always the political rants, that obscene post by a college friend or other messages that make your eyes roll – but for the most part, people use Facebook because it entertains them and it's part of their daily ritual. Research suggests this pattern holds in the United States and other countries, such as Taiwan.

It's automatic

A few years ago, some graduate students and I brought college student volunteers into our lab. We asked them to use Facebook while we recorded where their eyes travelled on the screen and how they responded psychophysiologically in terms of their heart rate, skin conductance level and facial electromyography muscle activation. Researchers have long associated these biological measures with psychological processes that could indicate attention, emotional arousal and what psychologists call emotional valence – that is, pleasant versus unpleasant emotions.

We were trying to understand the psychophysiological responses that precede specific behaviours on Facebook, such as pressing the "like" button as well as sharing or commenting on someone else's post. These behaviours have emerged over the years as indicators of online advertising and marketing effectiveness. Traditional advertising concepts like return on investment have been replaced by return on engagement.

Facebook has faced a growing mound of controversies in recent years. Photo/Getty Images.
Facebook has faced a growing mound of controversies in recent years. Photo/Getty Images.

We found that prior to pressing the "like" button, participants exhibited a particular pattern of heart rate activation and skin conductance level – the same one that characterizes an orienting response. This is a brief, automatic "What is it?" reaction to an external stimulus or a change in the environment. It's the same response you have, without much conscious effort, when someone enters the room or calls your name. It makes perfect sense that pressing "like" would have similar characteristics. Who, when scrolling through an endless newsfeed, pauses to think long and hard about whether to "like"? Very few!

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The fact that people press the "like" button in this automatic mode is significant for multiple reasons. First, the nature of the Facebook environment offers multiple bits of information at any particular moment, all competing for your attention. Specific bits that do catch your attention may be lucky enough to be rewarded with a behaviour – a "like" or a "share."

And from an advertising perspective, these automatic behaviours are important. Other studies my colleagues and I conducted found that expressing intentions to like, share and comment on something were strong positive predictors of participants' readiness to enact relevant behaviours offline. It makes sense: if you "like" a bunch of woollen socks online, maybe you're getting closer to investing in some new warm gear.

Targeted ads push you to act

The way people interact with Facebook is changing how they can be persuaded to think about or do a particular thing.

With tons of information presented at the same time, your brain is forced to decide quickly what's relevant or interesting. Facebook and other social media services take advantage of this – pushing you to slip easily from thought to behaviour. It emphasizes your impulses and decreases the opportunities for you to think more thoroughly about your perceptions, attitudes and decisions.

Think about seeing a product on Facebook, "liking" or "sharing" it, then immediately clicking the ad to place the product in a shopping cart on Amazon. Just like that, within a few seconds, you've moved from noticing a product and indicating an attitude online to that same product being purchased and marked for shipping to your doorstep.

This is a vastly different process from seeing an ad on TV, then having to get into your car or take the bus to travel to the brick-and-mortar store, picking the advertised product from the pile, holding it in your hands and taking it to the register for purchase.

Of course, not every single exposure to an ad on Facebook and other social media ends up with a conversion to purchase. There is a lot that does not end up in the shopping cart.

Facebook founder Mark Zuckerberg has an endured an onslaught of criticism since the Cambridge Analytica scandal. Photo/Getty Images.
Facebook founder Mark Zuckerberg has an endured an onslaught of criticism since the Cambridge Analytica scandal. Photo/Getty Images.

But having the infrastructure to facilitate these types of impulsive behaviours has ramifications for other areas of persuasion. Take alcohol use and overuse as an example. How does this thought-behaviour connection pan out when someone with a high risk of alcohol abuse sees a message from a friend or a marketer on Friday night promoting drinking? Or when a college student sees his friends posing with green beer mugs on St. Patrick's Day on Facebook? Would that prompt him to get that nth drink that would raise his blood alcohol concentration level to a risky one? Our research on the effects of branded alcohol posts suggests this is plausible.

Changing consumer habits combined with companies' abilities to target them with personalised messages streamed to their mobile devices mean advertisers and marketers are in a new environment. People mindlessly scroll, clicking automatically. Messages come at people nonstop, trying to convert them into consumers by exploiting those habits. And even at times when that conversion likelihood is low, brands can just try again, and again, and again and again.

Saleem Alhabash is an associate professor of advertising and public relations at Michigan State University.