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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.
Facebook allows "useful social experiences" outside Facebook by giving certain information to third-party services and websites. It could allow better targeted advertisements and hand over your data to others outside Facebook without your prior consent as it is turned on by default for all users.
There is, however, a way to disable it. Even as of today, many still cannot. It does make other websites more presentable and personal, but many have already said they do not want this in the first place.
"Vendor lock-in" is where users cannot access their data directly and are locked into a particular service. For many years, Facebook employed this method by not allowing you to manage your own personal data, delete it or extract it from the site. External plugins were banned and some developers were sent cease-and-desist letters.
Since, however, Facebook has opened its platform up further to allow users to download their data and to port it to another service, should they wish to.