The document discusses caching strategies for social media feeds. It describes using different caches for hot, recent content (inbox cache), older content for followers (outbox vector), and archived historic content (archive cache). It also discusses caching social graphs like followers and following lists. The caches aim to optimize for fast retrieval of recent home timelines and individual user feeds. Mutexes are used to synchronize cache updates between servers.
Sina Weibo is the most popular Microblogging platform in China. It has more than 100 million user and tens of millions of daily updates. This slide explains the performance challenges in Weibo platform.