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With over 600 million users on the site, it is difficult to find anyone under the age of 30 -- or even 50 -- who isn't on the social networking site. But when outages and upgrades kick off, so do the users of the site; many of which were frustrated and angered by the sudden change without warning to many of the layouts and user interface.
There have been so far 5 major redesigns, all of which have caused much controversy amongst the users of the site -- but over time many have simply learned to live with it.
But though there have not been many major outages of the site, there have been a few -- such as the forced-downtime when internal prototypes were leaked by accident.