It is the privacy established by these process's that is key.
These things bind them legally by the their laws established. To come after a private thing is problematic for the people engaging.
As Established by Public Notice.
Which is a prior reservation of rights.
Printed copy · Anthology Volume 6, page 636Printed copy from The Tender For Law Anthology, Volume 6, page 636 (printed 13 June 2014). Added by this site; not part of the Facebook export.