I don’t have any answer for you, but why do hou need it to be secret?

More on reddit.com

THE MODS OF THIS SUBREDDIT ARE NOT ASSOCIATED WITH FACEBOOK. They CANNOT HELP YOU with ANY Facebook issues. Welcome to r/Facebook . This sub is for: Posting technical support questions not related to you being banned/jailed from Meta/Facebook. Posting articles about the platform This can include videos as long as they are not your own Youtube videos and are "professional" in nature. This sub is NOT for: Complaining about the platform; you have all of Reddit to do that. Telling OP very unhelpful information like "just delete your facebook" when they are asking for help. Asking about how to get out of "Facebook Jail". Asking about your hacked account. This rule is in place due to spammers. They are BAD. This is an example of comments from one post from hackers attempting to get OP to contact them. IF YOU SEE THESE PEOPLE ALWAYS REPORT THEM TO ADMINS. No one here can help you with that. If you wish to find a place dedicated to talking about being jailed from Facebook, go to r/facebookdisabledme . Posting anything looking like a meme. Posting that Facebook is down. If you want to verify if Facebook is down go to: http://downrightnow.com/facebook Posting anything that shows identifiable information (your real name, your friends, etc). The exception to this rule is if the information includes a celeberty and conforms to the two bullet points that are accepted here. Posting Clickbait articles. Posting anything against the rules will get you a minimum of a three day ban and muted from modmail. Please note that r/facebookhelp has been retired. Related Subreddits r/deletefacebook/ - Meta/Facebook is truly not a good place, and if you can afford to, here is where you can go to talk about deleting it. r/Facebookdisabledme | r/facebookjail/ - Subs where you can go if you have been sent to Facebook Jail/Banned from Facebook. r/FacebookPages r/TimelineCovers r/facebookdrama I am a bot, and this action was performed automatically. Please contact the moderators of this subreddit if you have any questions or concerns. More on reddit.com

I think you can make the post and change the 'audience' setting before you post it from friends to only you.

More on reddit.com

Even if you could hide the story from your timeline, it never prevented it from appearing on other people's news feeds. I distinctly remember a notice appearing when you tried to hide stories, saying they could still show up on friends' news feeds and other places on Facebook.

You can change your profile picture's privacy setting to "only me" (which I don't think you could 6 years ago), which prevents people from accessing its details page (description, reactions, comments). I'm not sure if that'd prevent a story from being created, but I think that's your best bet.

More on reddit.com