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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.
Not only were breastfeeding images banned and censored on the site, there have been cases where words in searches were limited and restricted -- even the word "privacy" itself.
This has raised questions over censorship. There have been a number of cases where pages belonging to websites and businesses have been seemingly arbitrarily deleted or suspended because of a single complaint, with the complainant 'holding the keys' to effective ransom.
But various countries around the world have also blocked access to the site for fear that it could incite protests, as seen in the 2011 North African Revolutions.