Rather than linking to a paragraph on someone's blog, this ought to link directly to:<p><a href="http://www.canonware.com/jemalloc/" rel="nofollow">http://www.canonware.com/jemalloc/</a><p>It looks like in addition to jemalloc serving FreeBSD, NetBSD, and Mozilla, it is also used for Facebook servers:<p><i>Since 2009 I have adapted jemalloc to handle the extreme loads Facebook servers commonly operate under. Facebook uses jemalloc in many components that are integral to serving its website.</i>