algo-social-virality
Viral Spread Models
Overview
Compartmental models (SIR, SIS, SEIR) model how content/information spreads through populations. Susceptible → Infected → Recovered mirrors unaware → sharing → stopped sharing. Key metric: R0 (basic reproduction number). Solves as ODEs in O(T × N) for T timesteps, N compartments.
When to Use
Trigger conditions:
- Modeling how content spreads through a social network
- Estimating whether a campaign will achieve viral threshold
- Analyzing post-hoc spread dynamics of viral events
When NOT to use:
- When predicting individual user behavior (use influence scoring)
- When measuring engagement metrics (use engagement rate calculator)
Algorithm
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