Implementation of News Portal Recommendation System
News recommendations — balance between personalization and information diversity. Echo-chamber problem is real: if only recommend what user already reads, form information bubble. Plus news quickly becomes outdated: 3-hour-old article more valuable than yesterday's.
Time-Aware Recommendations
Freshness decay rate: for breaking news — aggressive (0.3+), for analytics — gentle (0.05-0.1). Optimal serendipity: 15-25% content outside usual interests. Metrics: CTR (2-5% good for news), session depth (3+ articles), return rate (daily active users %).







