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"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.
One user of Facebook managed to collect and seed on the torrent networks over 100 million users' public data; data that is available for 'everyone' to view. This caused outrage towards Facebook, with many realising the scope and breadth of how much of one's personal data is made accessible by the site.
Arguably, though the data was seeded to torrents, the data was available to see on Facebook without a username and password to even access the site. But it caused enough of a stir for Facebook to readjust its privacy settings.