Which pioneering strategy did Penguin Random House first implement in 2018 that revolutionized influencer marketing for books?

In today's digital age, the publishing industry has embraced influencer marketing to promote books and literary works. Major publishing houses now allocate significant portions of their marketing budgets to partnerships with BookTubers, Bookstagrammers, and literary influencers who can generate buzz around new releases. This poll tests your knowledge about how influencer marketing has transformed book promotion strategies in the modern literary landscape.

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The 'First Look Readers' program, giving advance copies to micro-influencers with 1,000-10,000 followers rather than just major reviewers
The 'Cover Vote' campaign, allowing Instagram followers to choose between alternative book cover designs
The 'Author-Influencer Exchange' program, pairing authors with non-literary influencers for collaborative content
The 'BookTok Direct' initiative, creating publisher-sponsored content specifically formatted for TikTok's algorithm