Is it acceptable to use proprietary software (platforms) to promote software freedom?

[Adonay Felipe Nogueira]

About the use of non-free social networks in FSF's DefectiveByDesign:
Yet again we must distinguish between free/libre software
activists/supporters/proponents and people who are only free/libre
software users (and that eventually participate in the activities).

See the DefectiveByDesign's notes on their Amazon
tagging/commenting/reviewing actions.