Make a Facebook Post in Multiple Languages

Now that you’ve enabled multilingual posting in the settings, you’ll see a new option in the text box where you type your updates; once you click Write something…, another option will appear. Click Write post in another language, and you’ll see another text box below the first one where you can select and enter the post in a second language.
Want to add a third language? Click Write post in another language again. You can do this for a large number of languages (I haven’t been able to find a limit; it’s possible that there isn’t one).

Now, when someone sees your post, they’ll be given the option to select a dropdown menu and view the post in any language that you’ve made available.