Hi,

here below the miracle usage of memcache.

creating large, interactive, database-backed Web sites spanning multiple servers. Approximately 70 machines currently run LiveJournal.com, a blogging and social networking system with 2.5 million accounts. In addition to the typical blogging and friend/interest/profile declaration features, LiveJournal also sports forums, polls, a per-user news aggregator, audio posts by phone and other features useful for bringing people together.

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Regards,
Senraj.A