YouTube partners with Bloomsbury to turn ACOTAR's book launch into a branded fandom activation

YouTube is supporting the release of A Court of Splintered Harmony, the sixth novel in Sarah J. Maas's A Court of Thorns and Roses series, with a publisher partnership that brings platform features normally reserved for major entertainment launches to a book campaign.

The activation, which appears to involve publisher Bloomsbury, includes a custom Shorts effect that reveals which Court a user belongs to, themed creator content, and a Starfall progress bar easter egg visible on ACOTAR-related videos.

BookTuber Haley Pham, who read the first five ACOTAR books in one week, features in an episode of YouTube's Channeling series, positioned as the face of the campaign for a community that has kept the series in discovery for years.

The move signals YouTube treating niche reading communities with the same activation toolkit it has deployed for K-pop fandoms, anime audiences and gaming launches, and it hands brands a live example of how to structure IP-led campaigns around participatory content rather than passive views.

What the activation includes

YouTube built special experiences for the release, including new content from BookTube creators and a custom Shorts effect. The Shorts quiz is user-facing: open Shorts on mobile, search for the ACOTAR Quiz effect, answer questions, and receive a result showing which Court from the series the user belongs to.

A themed Starfall progress bar appears on Maas-related videos, visible when watching ACOTAR content on the platform. YouTube is also positioning itself as the home for plot refreshers before the book drops and post-read discussion videos from fellow fans once readers finish.

The partnership sits within a broader fandom strategy YouTube has leaned into throughout 2024 and into 2026. Coke partnered with K-pop group Stray Kids, Sephora targeted Coachella attendees, the NFL collaborated with The Sims fandom, and McDonald's created its own anime.

Why YouTube is betting on BookTube now

69% of 14 to 44 year olds in the US watched videos from a niche community or online subculture in the past 12 months, according to research YouTube commissioned from NRG. BookTube qualifies.

Videos with "BookTube" in the title generated more than 350 million views in the first six months of 2024 on YouTube. The series itself has been a BookTube fixture for years, sustaining creator-led discovery long after the initial marketing push from a publisher would normally expire.

The last ACOTAR book before this one shipped more than five years ago, yet the community remained active. That longevity explains why YouTube positioned this campaign around fan participation and creator output rather than just discovery and reach.

73% of fans turn to YouTube for fandom content, 57% spend more time watching fan-made content than the original source material, and 62% are more likely to consider a brand that creates or sponsors content they are fans of, according to data YouTube shared at the ANA Masters of Marketing 2024 conference.

What brands and IP holders can extract from this

The ACOTAR activation demonstrates three principles that transfer to other fandom-led campaigns.

Lean into what the community already does. BookTube's format centres on reading vlogs, wrap-ups, plot discussions and character breakdowns. YouTube didn't ask creators to make trailers or ads. It supported the content format the audience already consumes, then added platform features (the Shorts quiz, the progress bar) that creators and viewers could reference and share.

Platform features as campaign assets. The custom Shorts effect is participatory by design. Users generate their own result, share it, and contribute to the campaign's reach without being asked to promote the book directly. The Starfall progress bar is an easter egg, not an overlay, which means discovery feels earned rather than imposed. Both are examples of using YouTube's toolset to create shareable moments rather than interruptive ad placements.

Use creators who are already embedded. Haley Pham wasn't hired to discover the series. She famously read the first five books in one week and documented it. Her credibility within BookTube makes her a more effective campaign anchor than a celebrity who has never mentioned the series before. Authenticity is the floor, not the value add.

This approach mirrors what YouTube has been signalling to Gen Z about fandom and creator-led content. The platform increasingly positions itself as the home for deep engagement with IP, not just for watching official releases but for the creator ecosystem that unpacks, extends and remixes them.

Where this fits into wider fandom marketing on YouTube

YouTube has been shaping a fandom activation playbook throughout 2024 and 2026. The ACOTAR campaign follows the same structure McDonald's used with its WcDonald's anime campaign, which recognised the massive anime community on YouTube (over 100 million related videos uploaded), launched an anime-inspired sauce and a four-episode anime series that mimicked fan-made music video styles.

74% of Gen Z respondents described themselves as video content creators, and 83% had used a filter, feature or effect on a video app in the past 12 months, according to YouTube's 2024 Culture and Trends report. The implication for brands: audiences within fandoms are not just consumers waiting to watch. They are participants waiting to make.

The shift from passive to active fandom changes what a successful campaign looks like. Reach matters less than participation rate. Views are the floor; remixes, shares and user-generated extensions of the campaign are the ceiling.

For publishers, entertainment studios and any brand managing IP with an established fan base, the ACOTAR activation offers a working model: identify where the community already gathers, build participatory features that align with how they already engage, and centre creators the audience already trusts rather than importing external spokespeople.

What this means for brands without major IP

Not every brand has a multi-million-copy book series to activate around, but the structural lessons still apply.

Fandom behaviour exists beyond entertainment franchises. Gaming, fitness communities, hobbyist subcultures (mechanical keyboards, fountain pens, niche sneaker segments) and verticals like personal finance all exhibit fandom-style engagement where passionate communities create, share and extend content around the thing they care about.

The opportunity is to treat your category like an IP and your most engaged customers like a fandom. That means building participatory campaign assets (quizzes, filters, challenges) that let people signal their membership and create content, not just consume it.

71% of 14 to 44 year olds watched videos explaining stories or details within a specific fandom or community, and 73% said YouTube is the best place for them to deeply explore their interests. If your brand or product has depth, complexity or culture around it, YouTube is positioning itself as the platform where that exploration happens at scale.

The risk is treating every campaign like a fandom play when your brand hasn't earned that level of investment from your audience yet. ACOTAR worked because the community already existed. BookTube was already creating, discussing and recommending. YouTube and Bloomsbury supported what was happening rather than inventing it.

For brands exploring this model, the first question is not "how do we activate a fandom?" but "do we have one, and if not, what behaviour would we need to support to build one?" If the answer requires people to care deeply about your product in a way they demonstrably don't yet, this playbook is premature.

But if the signals are there (user-generated content about your product, organic creator coverage, active discussion in comments or communities), the ACOTAR campaign shows what structured platform support can look like when a brand or publisher decides to meet the audience where they already are.