This gives a rough estimate. https://web.archive.org/web/20110915000000*/https://stallman.org/facebook.html https://web.archive.org/web/20110915000000*/https:/

This gives a rough estimate. https://web.archive.org/web/20110915000000*/https://stallman.org/facebook.html https://web.archive.org/web/20110915000000*/https://stallman...