# Three Faces of the Cold-Start Problem: User, Item, System — and Practical Solutions

> Source: https://sukruyusufkaya.com/en/learn/oneri-sistemleri/cold-start-problemi-user-item-system-cozumler
> Updated: 2026-05-13T13:29:33.716Z
> Category: Öneri Sistemleri
> Module: Module 1: Landscape of Recommender Systems & Problem Formulation
**TLDR:** The most annoying problem in recommenders: how do you recommend for a user/item you have no data on? Strategy map for user cold-start, item cold-start, and system cold-start — from Netflix's 5-film screen to TikTok's viral loop.