B
Evidence Grade B
Graded
accuracy verified by the review judge
Safe to Cite
Recent
15,000,000
15,000,000 -- videos analyzed for TikTok recommendation algorithm study (2025)
The study analyzed more than 15 million TikTok videos watched over a six-month period.
- The source specifies 'more than 15 million videos' / '15+ million videos'
Attribution:
View source
Lighthouse Research Team
Last verified:
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Source verified
Evidence graded
Value
15,000,000
Unit
Count
Data Vintage
2025
Entity
Sample Size
1,100
Evidence Quality
B
Strong, reliable evidence
Sourced from a well-regarded research firm or industry leader with transparent methodology and a reasonably large sample.
Single source - not yet corroborated
Score breakdown
Extraction
95
Source Trust
60
Citation Chain
20
Independence
30
Methodology
30
Freshness
95
Source
The Washington Post
Primary
Tier A
https://mddcadservices.com/inside-tiktoks-algorithm-what-15-million-videos-can-teach-marketers-about… ↗
Source Article
Inside TikTok’s Algorithm: What 15 Million Videos Can Teach Marketers About Attention
If you’ve ever opened TikTok “just for a minute” and then looked up an hour later wondering what happened, you’re not alone. You felt it—the pull, the rhythm, the uncanny sense that the app knew exactly what you wanted next. From a technical standpoint, it’s impressive. From a human standpoint, it’s…
Original Research
The Washington Post
· Original study ↗
Methodology
Washington Post analysis of user-downloaded TikTok data files from 1,100+ volunteers
Methodology documented
Segmentation
Industrymarketing
Cite this stat
Plain Text
TikTok recommendation algorithm study: 15,000,000 videos analyzed. Source: The Washington Post (2025). Via Lighthouse Intelligence -- https://lighthousedata.io/data/tiktok-algorithm-study-videos-analyzed
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<blockquote cite="https://lighthousedata.io/data/tiktok-algorithm-study-videos-analyzed" style="border-left:3px solid #2563eb;padding:12px 16px;margin:16px 0;font-family:system-ui,sans-serif;background:#f0f4ff;"><strong>15,000,000</strong> -- videos analyzed for TikTok recommendation algorithm study<br><small>Source: The Washington Post (2025) · <a href="https://lighthousedata.io/data/tiktok-algorithm-study-videos-analyzed" target="_blank" rel="noopener">Lighthouse Intelligence</a></small></blockquote>
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