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Contagious
Contagious explores the underlying mechanisms of why ideas, products, and behaviors spread through populations
since Jun 16, 2026 · HTTP 200
CohortClass of 2016What it is
Contagious explores the underlying mechanisms of why ideas, products, and behaviors spread through populations. It provides insights into social influence, network effects, and behavioral triggers that drive adoption and engagement across technology and consumer markets.
HTTP liveness
9 probes since Jun 16Jun 16Jul 12
AliveHard-dead (404/5xx/parked)RedirectedUnverified (timeout/DNS/block)
Observed events
probes · press · GitHub- Jun 16, 2026First probe — redirectedRedirected offsite
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Pulse Indexobserved activity
9 probes0 pressGitHub –Tranco –
Not enough observed signals for a Pulse Index (needs 2+ signal families).
Cohort survival · Class of 2016weekly
13,657 products launched in 2016 · 100% still active
13,633 active24 sunset
Still active
100%
Median lifespan
4.9y