Q: How do I tell a real organic trend from an astroturfed/seeded one?

Q: How do I tell a real organic trend from an astroturfed/seeded one?

Short answer: check whether ordinary accounts are spreading it, not just big ones.

Longer answer:
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Real trends show messy variety — different niches, qualities, takes. Seeded ones look templated.
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Look at the use-count growth curve. Organic climbs; manufactured spikes then flatlines fast.
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Check if small accounts (under 5k) are getting unusual views on it. That's the organic tell.
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If every example links the same product, it's a campaign, not a trend.

Verdict: jump on organic trends, be cautious with seeded ones — they collapse the moment the budget stops. The variety of the participants tells you everything about how long it'll last.