The account on Facebook was closed much time ago, and the site exist since years. When I had the site and the Facebook account at the same time, I refused to create a page, because I noticed Facebook decided what people would see, so it would be a pathetic try to reach them. But would it really be?
You say people there are brainwashed. I believe that they are not brainwashed necessarily. Most people simply seems unwanting to use their full human potential. But I started to see how Facebook was evil when I used Facebook! I mean, people need to start somewhere... And if they never were able to think about using another thing?
What I see is that the compensation for the sin of maintaining a Facebook page would be too burdensome. I would need to post like, once a month, a text about how Facebook is evil, or how the alternatives are worth a try, what the alternatives are, how to sign up to a RSS feed, etc. as a means of educating people on their liberation.
Also, adding on each post 'shared' there a note that I will not reply them there, and they should use [insert all other services and networks here]. This leads to another problem: people would start to shitcomment all over the page, because Facebook does not allows to turn comments off. The last time I considered all this guerilla plan, the comments moderation where the biggest problem. I won't login on Facebook every week to ban trolls and haters of me. This kills the plan.
Lastly, you say they will not be receptible of my texts. It can be true. But in this case, I do not lose anything. I will continue to have my site, and continue to spread my message in other means. What I see is that Facebook can just ban me when it wants, like happened to someone I know. I don't know the details, but he is locked outside his account if he does not gives some data. I don't remember if it's his ID card number, a telephone number, or other shitty thing. I don't remember either if he used the TOR Facebook address or the normal one.