If facebook has 30K servers, I highly doubt they have 25K of them being webserver.. Hyves (a dutch social network) at some point explained about 1 in 4 servers

If facebook has 30K servers, I highly doubt they have 25K of them being webserver.. Hyves (a dutch social network) at some point explained about 1 in 4 servers was webserver. The rest was storage, db, caching, proxys, chat, whatnot.