How Instagram and YouTube Are Reshaping the Consumer Purchase Path: From a Linear Funnel to a Fragmented “4S” Journey

How Instagram and YouTube Are Reshaping the Consumer Purchase Path: From the Linear Funnel to the “4S” Fragmented Journey

Event Overview

Over the past decade, a structural shift has occurred in the global digital advertising and social commerce industries: the linear funnel model ordered as “awareness–consideration–decision” is being replaced by cross-platform, non-sequential discovery and purchase paths. Boston Consulting Group (BCG), in a study published jointly with Google in 2025 titled “It’s Time for Marketers to Move Beyond the Linear Funnel,” pointed out, based on research into the behavior of 10,000 U.S. shoppers, that today’s consumer journeys are fragmented, switching among four overlapping behaviors: streaming (watching streaming content), scrolling (browsing), searching (search), and shopping (purchasing). BCG summarizes these as the “4S.”

In this shift, Instagram (owned by Meta Platforms) and YouTube (owned by Alphabet) are at the center. What they have in common is that they are no longer merely providers of advertising inventory; rather, they have been explicitly positioned by their parent companies as commerce infrastructure—Instagram offers Shops, product tags, and in-app checkout; YouTube embeds shoppable ads, product feeds, and affiliate tools into video content. Therefore, the key competition is not “social media versus television” but the battle among Meta and Alphabet (and TikTok, which has joined in recent years) for the position of “default discovery-to-purchase entry point.”

Market BackgroundMeta reported total revenue of $164.5 billion for fiscal year 2024, up 22% year over year, of which advertising revenue was $160.63 billion; in its annual report, Meta listed growth in ad impressions and an increase in average price per ad as sources of growth, and explicitly identified the "online commerce" advertiser vertical as the largest contributor to advertising revenue growth in 2024. The Family of Apps segment, which includes Instagram, had revenue of $162.36 billion for fiscal year 2024. Meta does not disclose Instagram revenue separately in its financial reports, but industry analysis based on Meta disclosures and third-party estimates (Emarketer, cited by Bloomberg and PYMNTS) shows that Instagram's share of Meta's global advertising business has risen from about 27% in 2021 to more than half of Meta's U.S. advertising revenue in 2025, driven mainly by Reels short-video consumption. It should be noted that this figure is a third-party estimate rather than official Meta disclosure, and its level of evidence should be considered when citing it.

On YouTube, Alphabet's fiscal year 2025 results announced in February 2026 show that YouTube's combined annual revenue from ads and subscriptions exceeded $60 billion for the first time. Alphabet's historical 10-K data show that YouTube advertising revenue grew from $8.15 billion in 2017 to $36.15 billion in 2024. Alphabet also disclosed that the global average daily views of short-video format YouTube Shorts are about 200 billion.

Platform and Brand ImpactPlatform. Meta's public statements describe Instagram as a "video-first platform." Reports cited by Bloomberg and eMarketer indicate that in 2024, users spent nearly two-thirds of their time on Instagram watching video; in terms of advertising revenue mix, Feed contributed 53.7%, Stories contributed 24.6%, and Reels, Explore, and Threads together accounted for a smaller share but grew relatively quickly. In its Q3 2022 earnings report, Meta disclosed that Instagram's monthly active users exceeded 2 billion, while monthly active people across Meta's family of apps in the same period was 3.71 billion. YouTube's global advertising revenue in Q4 2025 was $11.38 billion, up 8.7% year over year (per Alphabet's financial reporting, as reported by Variety); Alphabet also disclosed in its Q4 2025 materials that YouTube TV's NFL Sunday Ticket hit a record high in paid subscriptions for that season.

Brands and sellers. For brands, the changing role of platforms means adjustments to budget structure. When discovery, comparison, and transaction can occur within the same content environment, brands need to maintain a presence across multiple non-sequential touchpoints simultaneously, rather than optimizing spend around a single "conversion moment." BCG research shows that a single touchpoint (a YouTube video, an Instagram post that is viewed) can independently drive the decision for some consumers, while for others it only plays a supporting role—this turns the traditional question of "which layer of my funnel is this platform in?" into "which of the 4S behaviors does this platform dominate in my category, and how much influence does it have?"

Consumers. From the consumer's perspective, the boundary between content and transaction has been compressed, and browsing behavior itself takes on more research and comparison functions. This both reduces decision friction in some categories and increases consumers' sensitivity to content credibility.

Consumer Trend AnalysisGoogle’s own published research is one of the main verifiable sources for understanding this change. A survey by Think with Google in collaboration with IPSOS and with Magid Advisors, covering 10 countries and 20,000 respondents, found that consumers use search, YouTube, and offline research at different stages of the same purchase decision, for different purposes but sometimes with overlap, ranging from simple price comparisons to multi-round, cross-device research. Another Google clickstream study showed that in categories such as apparel, consumers typically spend about a month researching before purchase, and about one-third of conversions occur more than 30 days after research begins, which does not fit the assumption of a “short-path, linear conversion.”

The role of video is likewise being reassessed. Google and Material’s “Role of Video in Shopping Journey” study (August–September 2023, surveying 2,420 U.S. adults who had used online video platforms to shop) shows that video does not only affect the awareness stage. BCG’s research also points out that video’s role runs throughout the entire journey, rather than occupying the top-of-funnel position assigned by traditional media planning. On trust, Think with Google cites BCG research saying that surveyed consumers are 1.5 to 1.7 times more likely to follow content on YouTube, find it relevant, and trust it than on other social platforms, and about 2 times more likely than on other streaming platforms; this data comes from Google and BCG’s March 2025 touchpoint impact study. Google and BCG’s touchpoint impact survey (U.S. sample n=10,117, studying consumers who purchased beauty products within the past month or electronics within the past three months, covering social platforms such as TikTok, Instagram, and Facebook) likewise supports this direction.

It should be noted that many statistics circulating online, such as “a certain percentage of users purchase after seeing a product on Instagram,” mostly come from third-party marketing blogs, infographics, or SEO aggregation sites; their survey methodologies cannot be independently verified, nor can they be traced to primary sources, so they are outside the scope of citations in this article.

Regional Market Impact

From verifiable primary disclosures, Meta and Alphabet’s financial data are both global in scope, with limited regional breakdowns; the consumer research samples from BCG and Google are also mainly concentrated in North America (U.S. shopper samples, and a 20,000-person survey covering 10 countries). Therefore, judgments about the European, Asian, Middle Eastern, Latin American, and African markets need to be more cautious.The directional mechanism that can be confirmed is: ad revenue growth is jointly driven by ad impressions and average price per ad (per Meta's 10-K), which means that in markets with high mobile penetration and ample short-video consumption time, the same mechanism is more likely to be amplified; however, regarding regional differences in revenue contribution and conversion, there is currently a lack of publicly verifiable quantitative data, so precise conclusions should not be drawn. For cross-border brands, a more prudent approach is to first validate the effectiveness of the content-to-transaction integration path in relatively data-transparent markets such as North America and Europe, and then assess replication in other regions.

Future Trends

First, further integration of content and transactions. Instagram's Shops, product tags, and checkout, as well as YouTube's shoppable videos and product feeds, are all product capabilities in official public records rather than third-party speculation; the trend of platforms extending toward the "full journey" has already been established at the functional level.

Second, the reconfiguration of measurement systems. When journeys no longer proceed sequentially, methods of allocating budgets and attribution by funnel stage will continue to become distorted, and brands are more likely to shift to a measurement framework based on behaviors (4S) and touchpoint influence. A 2025 BCG analysis noted that companies that integrate marketing strategy across all 4S behaviors, rather than continuing to plan around a linear funnel, show higher revenue growth performance; the specific figure cited in its materials is that companies adopting AI-driven cross-behavior marketing integration have a revenue growth rate 60% higher than companies that still think in terms of funnel stages.

Third, the rising importance of evidence standards. As social commerce becomes a mainstream topic, statistics with unclear sources and missing methodology will continue to increase, and industry media and brand research teams need to more clearly distinguish first-hand disclosures (SEC filings, earnings reports, official research) from second-hand estimates.

Key Points

1. The linear purchase funnel can no longer adequately describe actual consumer behavior; BCG uses "4S" to summarize the four overlapping behaviors of streaming, scrolling, searching, and shopping. 2. Instagram and YouTube have shifted their positioning from media inventory to commercial infrastructure, with transaction capabilities embedded directly into content consumption. 3. YouTube scores higher than other social and streaming platforms on trust and attention metrics, while Instagram leans toward visual discovery and shorter decision cycles. 4. Video plays a role throughout the entire purchase journey, not only in the awareness stage. 5. Most third-party social commerce conversion statistics in circulation lack verifiable methodology; citations must trace back to earnings reports and official research.

Related Markets

North America and Europe (the main sample sources for platform advertising disclosures and consumer research); Asia, the Middle East, Latin America, and Africa (directions of trend spillover, but lacking verifiable regional quantitative data).

Related PlatformsInstagram (Meta Platforms), YouTube (Alphabet); competitive references include TikTok. Research sources: BCG, Google (Think with Google), Emarketer.

Recommended Tags

global ecommerce, cross-border retail, digital commerce, social commerce, consumer trends, marketplace economy, retail technology, digital retail, global marketplaces

Sources

Reference: MarkHub24, "How Instagram and YouTube Are Changing Consumer Purchase Journeys" https://www.markhub24.com/post/how-instagram-and-youtube-are-changing-consumer-purchase-journeys