Facebook’s 404 error page used to look like this:

Now it looks like this:

In some cases, it’ll take you back to the login screen:

But if you try any broken URL when you aren’t logged in, it’ll take you here:

From a technical SEO perspective, the strangest part is that their 404 pages are indexable:

That said, if you keep getting 404 errors on Facebook, go here for help.

Need more technical SEO help?

Try this.