you seem to be suggesting that having a completely blank profile (plus a protest message) somehow has a different effect on facebook's ability to use your profile to their advantage - it doesn't. The only real difference is that if you blank off your profile you can try to spread the message - either way you've left facebook and won't provide them with any more data, interaction, etc. Change your password to something randomised if you're worried you might be tempted back.

And saying "delete facebook means delete facebook" has literally no meaning at all. An act of protest has an aim, the point of deleting facebook isn't to delete facebook - it's to try to harm facebook. My suggestion does more harm.