If you really just want to pull it out I suppose you could find a screw that matches this nut and then you will have something to pull on. I’d be worried what kind of damage to the surrounding wood that would cause.
Seems like a risky move. The whole transition away from old Twitter could be over before bluesky even joins the race. It’s definitely lost my vote in favor of Mastodon. I can register for Mastodon right now.
But can you even try BlueSky? I looked at the website, but it appears to be invite only. Which is a strange choice as it seems like it will prevent it from ever succeeding.