What Is Social Media Marketing?
Social media are internet-based applications that build on the technological and ideological foundations of Web 2.0, allowing users to create and exchange their own content rather than simply consume content published by someone else (Kaplan & Haenlein, 2010). Social media marketing takes that idea and puts it to work for organisations: it is the use of social media technologies, channels and software to create, communicate, deliver and exchange offerings that have value for an organisation’s customers, partners and other stakeholders (Tuten & Solomon, 2018).
The scale involved is enormous. As of late 2025, an estimated 5.66 billion social media user identities were active worldwide — more than two-thirds of the entire global population (DataReportal, 2026). For marketers, that represents one of the most efficient ways ever created to reach a target audience directly, in the places where that audience already spends its time. But reaching that audience well means understanding how the social media environment is actually organised, not just opening an account and posting.
The Social Media Value Chain
Tuten and Solomon (2018) describe a Social Media Value Chain that organises this environment into its core components: the Web itself as the underlying platform, the social software that runs on top of it, the devices people use to access it, and the people and organisations who create the content. The shift from “Web 1.0” — a mostly one-way network of information, where users were largely passive readers — to “Web 2.0” was the turning point. Web 2.0 connected networks of people, not just networks of information, and handed control of content creation to users themselves.
That shift produces what economists call a network effect: each additional person who joins a platform makes it slightly more valuable for everyone already there. A restaurant review site is more useful once a thousand people have left reviews than when only ten have. A social network is more useful once most of your own friends are already using it. Network effects are a big part of why a handful of platforms have grown so dominant, and why new entrants find it hard to compete on scale alone.
The Four Zones of Social Media
Because there are thousands of individual platforms and new ones appear constantly, it helps to group them by what people actually use them for rather than by name. Tuten and Solomon (2018) organise the whole social media landscape into four zones:
Social Community — platforms built around relationships and shared interests: social network sites, forums and wikis. The point of engaging here is connection and conversation, not just consumption.
Social Publishing — platforms built for producing and distributing content: blogs, microsharing sites, and media-sharing sites for video, audio, photos and documents. The orientation here is knowledge- and content-sharing.
Social Entertainment — platforms built to provide enjoyment: social games, music, and video. The orientation is entertainment rather than information.
Social Commerce — platforms and features that support shopping, buying and selling: reviews and ratings, social storefronts, and marketplaces where a purchase decision is shaped by other people’s opinions.
Many platforms straddle more than one zone at once — a video platform can be entertainment one moment and a shopping channel the next — so treat the four zones as a way to organise your thinking about objectives, not as a rigid filing system.
How Do Social Media Platforms Make Money?
Most social platforms are free to join, yet they cost real money to build, host and maintain — so they need a monetisation strategy just like any other business. The dominant model, borrowed directly from broadcast television and radio, is what Tuten and Solomon (2018) call the interruption-disruption model: attract as large an audience as possible with content people want, then sell advertisers the right to interrupt that attention with a message. It’s the same logic behind a TV commercial break, applied to a news feed.
Not all value on social media is monetary, either. Tuten and Solomon (2018) use the term psychic income, also called social currency, to describe the non-monetary reward people get from participating — the satisfaction of a helpful review being upvoted, or a follower count that signals real expertise. Understanding that people are motivated by more than money is central to why organic engagement (getting people to genuinely want to interact with a brand) still matters alongside paid advertising.
From the Four Ps to a Fifth: Participation
Traditional marketing is generally taught around the “Four Ps”: Product, Price, Promotion and Place. Tuten and Solomon (2018) argue social media has effectively added a fifth: Participation. Traditional marketing communication was largely top-down and one-way — a brand broadcast a message, and the audience received it. Social media flips that: audiences now talk back, share, remix and sometimes even co-create the message. A marketing strategy that ignores this two-way, participatory dimension of social platforms is really just old-style broadcast advertising wearing a new interface.
Summary
Social media marketing is the deliberate use of social platforms and technologies to create and exchange value with an organisation’s audience (Tuten & Solomon, 2018), built on a Web 2.0 foundation that puts content creation in users’ hands (Kaplan & Haenlein, 2010). With well over two-thirds of the world’s population now active on these platforms (DataReportal, 2026), the scale on offer is unprecedented — but scale alone isn’t a strategy. Understanding the Social Media Value Chain, the four zones that organise the landscape, how platforms actually make money, and the participatory shift from four Ps to five gives you the foundation the rest of this course builds on.
