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I am afraid not exactly that way.
Moreover, first you would have to make sure your domain is using Cloudflare (nameservers can be checked at your domain registar) and has been successfully added to your Cloudflare account.
Second, you would have to go to the DNS tab of your Cloudflare dashboard for your domain and make sure you have got an A yourdomain.com and A www records both being pointed to some IP address like 192.0.2.1
In case if you struggle a bit how to manage your DNS records, kindly see below two helpful articles about how to add or edit your DNS records:
Third, you would have create a Page Rule under the Rules → Page Rules tab, therefore click on the button “Create a Page Rule” with Forwarding URL - 301 Redirectfrom which one (*yourdomain.com/*) to which one you want (facebook.com/some-page).
It’s part of a reserved IP address range and is safe to use in a private setting. Since you need a DNS entry for a page rule to work, you need an IP address in there. Not one that will actually resolve to someone’s website, and not one that’s so bogus that it won’t pass validation. Home networks will often be in the 192.168 range, and Cloudflare won’t validate that for a hostname, but 192.0 is ok.