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Yes but if the BBC initiative starts spreading this might change in the future. No?

Major sites have been maintaining tor hidden endpoitns for some time now. For example:

What are the use cases for browsing Facebook through Tor? For me it sounds kind of like asking a prostitute for a hug.

People in countries with oppressive regimes that are not aligned with the US.

The emphasis was on "why Facebook", not "why Tor".