// TOPIC
#fanout
2 articles
◆◆◆AdvancedMetaInstagram
01Design a News Feed (Facebook / Instagram)
How Meta builds the home feed — fanout, ranking, candidate generation, and how the same architecture serves billions.
#interview#feed#fanout
16 min◆◆◆AdvancedMetaTwitter
02Design Twitter / X (the home timeline)
500M users, 500M tweets/day, p99 feed loads under 200ms. The fanout-on-write vs fanout-on-read trade-off that defines the system.
#interview#feed#fanout
16 min