How do I prove Facebook without enabling Facebook Platform?

I get to where I am asked to make a Facebook post and trying to click that link I get this request:


I am not interested in enabling Facebook platform even for Keybase (and there are far more useful services that would use Facebook platform), so how do I proof my "ownership" of my account without letting all kinds of apps (including those that "friends" use) access whatever I have entered to Facebook?

* * * * *

Update on 2018-09-05: I have removed my Facebook account months ago, so this issue doesn't concern me anymore, but I am keeping this open as this affects everyone using Keybase and Facebook even if only the users blocking Facebook App Platform become aware of this.

Start by reviewing the Facebook proof flow described in the issue and the linked screenshot, then read the four comments for any prior decisions. Done means the issue has a documented path for proving Facebook account ownership without enabling Facebook Platform, or a clear explanation of why that is not possible.

Written by the indexing model from the issue text.