You really think a site the scale of Facebook just pulls the latest version of mySQL and deploys it? I think even smaller sites like Smugmug put new releases t

You really think a site the scale of Facebook just pulls the latest version of mySQL and deploys it? I think even smaller sites like Smugmug put new releases through extensive testing before deployment. It seems to me that pulling the source, applying their patch and building is probably a pretty small part of the effort of rolling out a new version.